What the fuck are you talking about? She/he/whatever just tried to get more details out of him. If he just said "I muffled my mother", anyone would disregard that. And if she told him that it is wrong, he would stop. Yeah, they are guilty of keeping it to themselves for so long, but at least now we know the truth.
Fuck off with that, this is exactly what Chris's whiteknights were telling all those years. "Yeah, Chris almost run over Snyder, but he is autistic, yeah, Chris maced someone, but he is autistic". He knew perfectly well what he was doing, somewhat tried to hide and when Dillin straight asked him "did you do it?", he replied with "yes, but it keep it secret", not "yes, but it wasn't my idea". Jesus, what Chris should do so people would say "yep, it's his fault"? Turn his van into van of peace?