Yeah, I don't think anyone's calling her a innocent lamb or saying she definitely didn't commit murder or wasn't guilty of some sort of involvement. It wasn't proven, and cases aren't meant to be tried in the media with a jury of the multitudes getting testimony from tabloids and cable news networks.
Maybe I am wrong, but you're free to point to anyone's post saying she deserved to walk free because she obviously was without guilt in the concrete sense rather than this being a case where the prosecution either failed to do their job or didn't have enough evidence to prove their case..
Of course, this would be a totally different story if she was fat, ugly, poor, not-white, or any combination of those "faults". She'd have been sent upriver, and I doubt anyone voicing concern over the strength of the evidence would have been heard. There are too many people serving time/facing death in the States based on bad evidence to say that that wouldn't have been the case.