
He didn't just kill Jon for the same reason bad guys never just shoot James Bond. it would be a very short boring story. Dracula is obsessed with his lost wife. I have read the book as I said before. And no, I never said that anyone who loses a loved one should go on a killing spree, I said that it is very disrespectful of you to call someone being so upset at the death of their spouse a pussy, and it is. His initial reaction was completely understandable, but over time he went insane with grief.
1 dimensional characters are "bad ass" when you're 7. People with actual intelligence and a love for storytelling prefer characters with motivation. As a creative writing major I find 1 dimensional "evil characters as a cop out for a writer who can't think of an interesting back story.
Being evil for evil's sake is the dumbest thing possible. No one, NO ONE thinks of themselves as doing the wrong thing. They do what they do because in their mind it is what's right. Even Adolf Hitler thought what he was doing was for the greater good. You need motivation, or your just another 13 year old fanfic writer.
I have a feeling of pity for Mathias, up until he has Sarah killed. Even less after he murders thousands of humans in 1476. He has a sad past, but that hardly makes us justify his slaughter of so many humans.