who is he?

let him live it said that's the moral thing to do it said kill him it said or else he'll kill you it added who is he? it asked an old friend? it asked or a foe? it added i know him not i answered and I've never met him before i added i thought he's one of those, but he doesn't know the midnight song i added I'll let him be not that he is without sin, but because he is among the few, who know how to live without guilt but still, I'm not pleased with his point of view of how he dims himself righteous while others he easily sues. truly we are evil in blue but yet we are righteous too. so remind me again why should i let you live?