I listened again.

Matty etc definitely have the same vocal pattern of a horrible middle school kid who narcs on the other students. He feels superior to them in every way and they really hate him. As he grow older - he has no regret or doubt. In fact - he gets worse and he's even more superior because minders are needed so people are reminded to follow the rules and do the appropriate thing. It's important.

In a zombie movie such a horrible guy locks people out of a building or a house and they die. His only true interest is himself. And if it's discovered that he killed people by locking them out - he baldly lies and says that he did it for benefit of the rest of the people in his group.