If you wanted to make sure no one went to prison ever, that would be the way to do it.
Pretty much. I know I sure wouldn't vote to convict anyone if there were any chance of me being imprisoned/killed. It could be Charles Manson & it still wouldn't matter.
With that said, I have thought about potentially punishing the prosecution for "frivolous prosecution" in instances where the case was outstandingly weak, but those that would probably need an acquittal to even be workable. If the person was convicted anyway, the case was probably strong enough for the jurors or judge.