4 year old identifies mother's killer

What’s really good with people killin others in front of their children? Jeez, niggas is straight heartless. And from what the cops say, it sounds like the child will recognize the killer if he ever sees the person again. Might as well have killed the kid too, otherwise you risk havin the lil bugger grow up and huntin you down. At least that’s what happens in the books I read.