So what's your point? Cats are less destructive than humans? Are you suggesting that we ignore anything that is less destructive than humans? Or that people should live in smaller houses to lower their impact?
Sounds like a pointless statement to me.
We should do something about the low-hanging fruit of cat owners not being responsible for their "pets".
I put pets in quotes because if you have no control over it and just let it roam everywhere killing native fauna, can you really call it your pet? Just because it comes to eat your food sometimes?