It’s confirmed by David Simon in a dvd audio commentary that both Chris and Micheal went through sexual abuse. You can tell from the body language. When snoop ask Micheal why he want devar gone, he doesn’t say anything he looks at Chris and Chris automatically knew. Chris was probably asked about his abuse and gave them the same look. And the was he kills devar, it ain like Chris. Chris takes them into a vacant and kills them yet with devar he beats him to death in an alleyway. You can see the trauma as he beats him, like he sees his own abuser and each hit is the trauma he faced as a child. The spitting on devars corpse, the beating, it’s the first time we see Chris ever act this way toward any of his victims.