Security ... think about it!
Cats are smart. Humans are dumb. Cats live in the moment. When they are tired they sleep. If something gets annoying they walk away. Cats also have the ability to react without thinking. They can go from totally relaxed to pulling off acrobatic feats that would shame most martial artists. I share living quarters with four cats and I can honestly say that have the highest respect for the species. The more time I spend with humans the more time I want to spend with cats. Decent humans are the exception and are very rare.