This would have easily eliminated things such as Akrasia, where our rational thoughts do give a solution, but our instincts do not allow us to use them.
It tried that with your great^x uncle. But he actually spent his time doing the things he said he wanted to do instead of what was best for him in his circumstances and had enough willpower to not cheat on his mate with the girls who were giving him looks.
It tried that with your great^x uncle. But he actually spent his time doing the things he said he wanted to do instead of what was best for him in his circumstances and had enough willpower to not cheat on his mate with the girls who were giving him looks.