Secondly, do you honestly think gangsters would hear that a 5 year old accidentally killed someone somehow, wasn't charged with a crime, and conclude "Hey guess what? Looks like we can kill people at will and we won't get charged. That kid got off...."
Little Jimmy, 5 years old, kills his mother (intentionally or otherwise). A tragedy, to be sure. All the kids at his school hear about it, and ask him questions, how did it happen, is he okay. He says he did it on purpose.
Five years later, he's 10 years old, kills his little sister. Another tragedy. Something's clearly wrong with him, but he's underage, so he's not tried for murder. His classmates talk about it at school, the topic of his mother comes up, and they wonder why he killed his mother and his sister, and how has he not faced any serious consequences for his actions.
Another five years go by, he's 15 years old, he kills his best friend, but since he's underage, he isn't charged with murder. He gets sent to juvenile detention, and then somehow, a few months later, he's out on "good behavior." His peers start to wonder if anything will ever be done to stop him, or if there really aren't any consequences to their actions.
Five more years, he's 20. He kills a random person on the street. His lawyer successfully gets him off by claiming he's not mentally stable enough to stand trial, and the leftist judge lets him walk. His former classmates see him on the news, and one or two of the rowdier bunch go out and vandalize a gas station, because they see that their former classmate got away with murder, and all he had to do was plead insanity, so what harm could vandalizing a gas station do? I mean, it's nothing so serious as what he did...
I could continue this analogy, but maybe you can see where I'm going with this.
So again, I ask,
if we allow one person to get away with a crime, what does it teach him and other (would-be) criminals?
What does it do to the foundations of civilized society?
When consequences for actions are removed, how does it affect those around criminals?
In gang-infested areas where enforcement of the law is more of a suggestion than a requirement, is it more or less common for there to be corruption of the people not in gangs? Do the regular folk tend to obey the gangs more than the law of the land?