Andrea Yates found Not Guilty? What?

If you intentionally kill someone (and you're not in a war or something), then clearly you are insane. That should not be an excuse for killing someone and therefore you should not be set free for saying you were insane when you killed a person. Obviously you were insane. That's not debateable. She kills her 5 children then goes free? Uhhh....yeah she may have been extremely stressed out about her life and having 5 bratty kids that were running her life and she couldn't do anything else with the rest of her life but take care of these kids and nobody would listen to her problems and her husband didn't see what was going on or the seriousness of it or whatever. So she killed her kids. Set her free because of her problem? I don't think so... YET in another case, a guy named Ryan Ferguson is convicted of murder because his friend had a dream that he did it? What the
FUCK ladies and gentlemen?