Games with morality systems have brought something to my attention: People LOVE to see a hero go bad.
Something about watching Spider-man, or Superman, or Batman, or any other hero start to lose their grip on their principles and become corrupted is something a lot of folks (myself included) love to watch. And it's not just the badass costumery either. Watching a maddened Superman kill a criminal in cold blood after this villain has killed a good friend of his is somehow... humbling. Watching Wonder Woman kill Max Lord was equally well done and these incidents show that no matter how principled the hero, everyone has their breaking point, and when the hero hits that point, pray to whatever God you believe in that you be spared the flame.
Now then, I've mused on this many times, but have never before actually put thoughts into writing.
Why do we find this sort of story event appealing? By all rights, we shouldn't. A hero abandoning their principles and acting strictly according to their wants is often a bad thing, because when you have the ability to level a city block just by taking off your sunglasses or can make a grown man believe he's a six year old girl for the rest of his life just by THINKING ABOUT IT, your moral principals are pretty much the only thing keeping society safe from you.
When a superhero starts to waver in their beliefs, they are at a tipping point. They can either go back to being who and what they were before (and they usually do), or they can go the full Benedict Arnold and turn into a villain. Furthermore, some pull an additional about-face and eventually go back to being a hero, because screw consistency.
The first example of why we find these scenarios so popular is at the "Tipping Point" stage.
The Hero in Question: Spider-man, an icon familiar to many, and a hero in possession of one of the most well known lapses in super-principles.
When Spider-man first discovered what his symbiote suit could do, one of his first thoughts was how much more good he could do with this new power. Wouldn't that also be what would go through most of our heads? And sure enough, he used the power to great effect, and for a time, it was good. But with great power comes great responsibility, and with GREATER power comes even GREATER responsibility. Spider-man began to waver in his beliefs, becoming more and more corrupted by his new power (some may submit that it was the symbiote actively turning him evil. That's an entirely different discussion, so let's keep this example simple). Spider-man became increasingly violent, dealing with his enemies in more and more brutal ways. And for a time, it was quite badass. But then he reached the threshold of good and evil. He had to make a choice, and he came to grips with who and what he was becoming. He didn't want to become a monster, and ultimately rejected the new power in favor of his old self.
In this scenario, Spider-man has learned that great power and irresponsible actions does not a great hero make. He learned a valuable lesson, one which he never forgot, and it deepened his character. Who can argue with that? Plus it gave us Venom. Go Venom.
But what if the hero DOESN'T turn back? What if they turn into an actual villain?
The second indicator is when the villain the hero becomes is WAY MORE INTERESTING AS A CHARACTER than the hero version ever was.
Hero Villain in question: Sephiroth.
While this should be a big "duh", hear me out. Sephiroth has created legions of fans for no reason other than wearing black, having a huge sword, and going batshit insane. Oh, and he's pretty. Ish.
Yes, I prefer Sephiroth being a hero, but I'm a rare duck in that regard.
Sephiroth is one of the gaming world's most famous examples of a Face Heel Turn, and a character turning completely evil. He was an okay guy, loved by, iunno, EVERYBODY, and furthermore, was aware of that fact. And yet, he reached his breaking point, and well.... a lot of people died.
Sephiroth burned a village and slaughtered the locals. Then Zack and Cloud beat the ever loving crap out of him, and actually killed him. But Sephiroth cheated death, and quickly readied himself for round two. Concocting one dastardly plan after another, he almost became a god. Too bad Cloud killed him. Again.
Two deaths could not keep Seph down, and well... Cloud killed him AGAIN. Maybe people like him because he's so persistent? Whatever the cause, Sephiroth the villain is almost universally considered more interesting than Sephiroth the Hero, and seeing as they are the same guy, I don't think his good looks have anything to do with it in the end.
Sephiroth became a classic case of with great power comes great insanity, and one reason why the story of this hero-turned-villain is so popular is because he is always thwarted by Cloud at the last minute. Imagine the bummer that would have been if Sephiroth HAD become a God... and then the game ended because Cloud had been too late. And the inevitable sequel HADN'T happened. You'd be pretty pissed. So people are free to like him as a pretty, fictional villain, because he will never actually win; no matter how dire the situation, someone will always rise to defeat him.
Sometimes though, a hero-turned-villain learns the error of their ways, and goes back to being a hero. This is often the most popular of story events in this genre. Just as people love to see a hero go bad, they also like to see a villain turn good.
The Hero villain Hero in question: Darth Vader.
Darth Vader is one of the most popular villains, and as Anakin Skywalker (Also read: Total Ham), he was increasingly corrupted by fear of losing his beloved (but nobody in the audience with a soul liked Padme anyway). He became Darth Vader and led the almost total extinction of the Jedi. He committed even more nefarious deeds and became one of the most feared men in the universe. And yet, love for his son overpowered his evil, leading him to redemption in the end. In the end, Anakin Skywalker was given a noble rebirth, right before his unfortunate death by asphyxiation at the hands of his son whom he so nobly killed his Dark Master to save.
We love this sort of story, because in the end, the one thing we like to see more than a hero fall is a villain redeemed. When the two combine, you have frankly, poetry in action, and it's going to get people cheering, crying, or whatever else the scene calls for. The villain, his heart calloused and encased in ice, experiences something that melts his cold heart and reawakens the noble knight who once was. It's a classic tale, and people LOVE IT.
Because dammit, GOOD ALWAYS WINS IN REAL LIFE.
....Doesn't it...?