In fact, you even overlook the bad points without knowing it. I wish I had the other system. Not too many, I'll guess. The reason is simple, really - Everyone wants to be a winner. No one, of course.
People have a tendency to validate their beliefs, lifestyle, etc.
Everyone wants to feel good about themselves in every way. Since they want to be in the winning camp, it's in their best interest to advocate whatever system they own. Some of these reasons seem illogical - and I agree that they are. However, we're talking about humans here. Some of them never do, it seems.