You're a judger. The truth is you or I am not his judge and the Bible states this. This is why the Bible says not to judge because you have no idea what he went through as a child, young man at all.
The Bible says:
For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.
God knows everything and he is the judge. We as Christians are not supposed to judge anything we are to love everyone and be merciful. turn the other cheek. If you're a Christian it's because of people like you who judge so quickly and easily that he hates Christianity. Your mindset is part of what makes a person like Gaahl.
You label him as a misanthrope yet you don't have the compassion to ask yourself why is he a misanthrope. The guy was born into isolation and went to school for 18 years with one other student. It's people like you that judge him that inspires him to hate society. Be humble and try to learn from people. You're judging him and me and you are not our judge. I am a real Christian I love everyone without judgement. This is what Christ admonished us to do. Your problem is you mistake the Bible. The Bible calls us to be witnesses of Christ. A witness shows Christ's love and that love is never demonstrated via judgment... it is demonstrated via trying to learn a situation and never judge. If you're a Christian you are indoctrinated into some wack teachings. If you are unsaved you should not judge spiritual matters you do not understand.