I was born without the 4 wisdom teeth, I mean, I've never had them at all, while some people have them yet they don't grow. I've been told it's an trait of evolution. I've read that it is probably useful in order to avoid feel the pain of the growing teeth at an adult age, which distracts one from mating and defending their own life. lol.
back molars are meant to chew on hard meat btw.