fantasy, or real life?
fantasy, it's like comparing say Joker (who sometimes is killing with "good" reason but is generally unstable and likes chaos) to Dexter (although he knows he's bad, but "has to kill" so it's damage control who he targets
).
In real life you have say Westboro Baptist Church, aka The Most Hated Family in America, who knowingly do horrible thing, but justify them by saying they're preaching the word of god
Vs the murderers etc we hear about on the news.
hmnn it comes down to point of view, ppl not in westboro baptists church could say they're just bad people so no different to the bad bad ppl