I'm not going to hypothesize a bunch of stuff that didn't happen and probably wouldn't have happened regardless. there is no point in talking about the butterfly effect.
Stuff did happen because of small things, and thugs will continue to happen because of small things.
There is a point, it is completely relevant to the discussion. It's an entire theory that has been studied for decades that happens to contradict your argument.
Besides, it's pretty stupid to think that a major war wouldn't affect your life in any way. Say we lost the war, you probably would be living in a completely different country. Thousands of children wouldn't be born because their parents were killed.