I'll disagree, he lived through nothing but hate and abuse throughout his entire life. The proof that he is a decent person is in the fact he hasn't lashed out more so far. Did he commit a crime and acted as a dick? Yes. But would he do better under different circumstances? Manga has already told me that the answer is a resounding Yes.
Anyone wishing him unwell should probably walk in his shoes a mile.
Sure, this story is made-up. However, I've recently seen a story of a real-life modern Nazi, with swastikas tattooed and whatnot, whose entire life was permeated with nothing but hate and abuse. However, after prison he met a person who reached out to him. His parole officer, a beautiful black lady. Eventually they married and he led a very different life since. So, was he born evil or did his surroundings turned him in to one?