The Vampire Diaries 2.01

There is a quote from Terry Pratchett's Men At Arms that perfectly explains why Stefan is ten times more dangerous than Damon, despite by the good guy.

If you have to look along the shaft of an arrow from the wrong end, if a man has you entirely at his mercy, then hope like hell that man is an evil man. Because the evil like power, power over people, and they want to see you in fear. They want you to know you're going to die. So they'll talk. They'll gloat. They'll watch you squirm. They'll put off the moment of murder like another man will put off a good cigar.

So hope like hell your captor is an evil man. A good man will kill you with hardly a word.

We saw a bit of that in the season two premiere which was, by the by, completely freaking awesome.

( Spoilers )