Thinking of Zombies

Just watched Train to Busan. I find almost all zombie movies have the same theme in common:

A group of like-minded individuals, all concentrated on working towards the same goal, can accomplish their objectives even against insurmountable odds. They may not have been the brightest or fastest, and sure, they may not have been coordinated enough to be called a "team," but instead of spending their time fighting each other, they spent 100% of their energy focusing on the task at hand.

If only the silly humans exercised that same strategy, some of them would have survived.