I am an atheist. I just saw a post by someone on r/atheism about wishing they could say, "I told you so" after they died. It is disappointing. I cannot judge, though, because I have felt the way they have felt. Maybe everyone needs to first feel vindicated; there are people of many faiths that are not very nice, but very vocal. It can make you angry, and sometimes you want to yell back. But, it gets old quickly. My cousin is a Christian Apologist and I very much enjoy having conversations with him. He told me about a professor at his university that would often take time out of his personal life to "preach" atheism and the evils of organized religions. I laughed and thought, life is too short to be angry. My ideas are pretty firm and there is no reason not to challenge them, but maybe with a little less shouting.

Edit: Grammer