First of all, he wasn't sentenced to life. He was sentenced to life without parole. Quite a big difference there in a state like Florida.
Second, he was 12, with the IQ of an 8 year old, when he did this. It was, I would say, worse than a school shooting- most of the shooters were picked on to the point where they snapped, while this kid simply beat a girl to death- but he was *12*.
There's no question that the mother is partially to blame, as is the attorney, for not watching him (and for neglecting the girl she was supposed to be babysitting) and for turning down the plea deal, which, IMO, suited the crime.
However, at the base of it, this is still a 12 year old borderline retarded child- whom the state is currently keeping in solitary at a juvenile facility simply because you don't put a 14 year old into GenPop of an adult prison.
There are only two ways to treat such a crime; the 15-25 year sentences people have suggested wouldn't work, because the end result would be a free 40 year old with a sixth grade education who'd spent the last 25 years of his life learning how to kill people *better*.
One way is to put him in juvie for several years and make sure he's well supervised when he gets out.
The other is to lock him up and throw away the key in the name of 'sending a message' to all those other 12 year olds who have the IQ of an 8 year old and happen to be watching CNN.
Even the DA's were smarter than that; they offered a fair deal that the child's 'protectors', incompetent morons to the end, turned down...but I guess some of the armchair prosecutors here have no problem whatsoever sentencing a 12 year old to, essentially, a few decades of anal rape followed by death.
No matter what that child did, it isn't worth that.