What IS good, and how do we determine it?

[Mister Agenda]

And cats are so well known for how well they cooperate in large groups, I guess that blows the whole idea out of the water.

Don't take my word for it, do a quick google search!

I learned about it on the animal channel. I was pretty traumatized by the sight of lions killing baby lion cubs.

My point was that you missed the point. Cats aren't highly social animals. Even when they are social (as in lion prides), they're social in a very different way than canines and primates, perhaps because they haven't been at it as long. Your example doesn't contradict the point being made.