I woiuldn't say I don't care, but I don't give it almost any importance as a national news story.
It seems to me it's a sad case where one guy trying to catch local criminals encountered an innocent boy and the hostility of their interaction - whoever was at fault, combined with the former having a gun - led to argument and violence quickly and a fatal shooting, with one more at fault than the other where it's very hard for us to tell just what happened.
It speaks to a few things. One is the danger of people going around armed. Another is the danger of people confronting suspiciious strangers - something I have some sympathy for. for example, I saw a kid who could have been Trayvon's age on a bike in my neighborhood I thiought was suspicious. I told him I wanted his name, he was hostile. Wanted to know why I asked, I mentioned crime in the area, and followed him in a car slowly for blocks. He got on his cell phone and eventually someone else who was pretty clearly to me a criminal type around his 30's met him and tried to seem threatening. I didn't have a cell phone to have the police check them out. For example, they were laughing about the spot he'd stopped being the place local drug deals used to be done - something they seemed familiar with.
The next day a third young guy who seemed to be a gang member had the nerve to come to my house where this had started and yell crazy things (about how he was the devil and such) and demanded his friends be left alone. He left by the time police responded to my call.
Any of these situations cold easily have escalated; on the other hand, I did not feel like ignoring suspicious people when there were crimes going on.
Before this, for example, I had the experience of being on the computer late at night, when a face appeared in the window to my back yard around 2AM of a would-be burglar.
Bottom line is that a case like this is tragic, but often the evidence of just who did what wrong is hard enough to obtain that any standard of 'beyond a reasonable doubt' is likely to leave much crime unprovable, and that's the least bad situation - hopefully there's enough chance of a crime being proven to provide some motive not to do wrong.
At least it's not the istuation in India, where a young perpetrator is charged being one of a mob who raped and killed a girl, and if convicted the maximum is three years.
I'm largely in favor of rehabilition of young people (and everyone), but that's extremely light.
Of course, these are all reasons in addition to other reasons for trying to reduce problems with poverty, education and more to help prevent crime and other problems.