And yet they don't kill us... Because until they evolve opposed thumbs, they can't operate a can opener or get into the food closet!
Though General Sherman opens doors with no problem. Little bastard. He also stole the key to my gun cabinet and 'lost' it under a carpet. It took me a month to find it. Literally pulled it out of the lock and buggered off with it.
Studies also show that cats love us... so must be a love-hate thing. Which is why they are more interesting than dogs. If not as useful!
Cheers,
Sirhr