We’d eat them if we were hungry enough
They’d eat us if we were small enough.
And the house cat has such a strong prey drive they’d likely do it for fun. I suspect when Mr. Rorschach bites on my hand he’s testing the flavor.
There has been cases in the past of cats eating their owners after the owner died and nobody fed them. They do what they need to survive and I would not begrudge any animal for that. Sure it may be horrendous to see, but I’m dead so what do I care.
Do also note that dogs have been known to do the same. Cats have a lower threshold for that and are more likely to do it in general, but they do tend to wait until they’re literally starving before eating a friend.
Another fun fact about cats is that they are more likely to go feral because they have not been domesticated as long as dogs. Dogs and cats basically domesticated themselves to get food, but cats only began domestication 12k years ago which is not long considering the history of humans.
I sure would eat my cat if I am hungry enough, but I am never hungry enough so I don’t eat my cat nor any other animal. There are plenty of other things to eat that don’t involve killing animals.