I know nothing about biology, but how about this:

The evolutionary path was influenced via selection. Those who made and used tools were more likely to survive/mate successfully, and those who made and used tools also tended to use them as eating utensils, which mechanically leads to an overbite. So eating with a fork doesn't directly lead to being selected for survival, but it's likely if you eat with utensils you also use other tools for things like hunting, defence, etc. and that does lead to increased survival.