It never did. Conflict is what makes a person mature. This is the reason why education is important, to provide opportunities for people to disagree with each other, and then learn how to deal with disagreements. What? You think your dad is going to hold a debate competition between your siblings on who gets to have the car over the weekend?

This is also the reason why asians (with the exception of the Elevens) are so immature, it is because they avoid conflict.