I started playing RimWorld again (new DLC!) and I use the Anthro Race mod, which requires Humanoid Aliens as a base, and that adds a couple new ideology options about cannabalism.

You can be against cannibalism of your own species, but fine with eating aliens. I have it set this way. And yet, butchering any humanoid still gives you negative thoughts even if eating the resulting meat them doesn't. It's kinda stupid. I want them to be respectful of other races and not just try to kill everyone; but anyone who dies attacking us should be fair game as food (as long as they aren't a member of the Anthro race).

It's been so long since I last played, I forgot how to edit the ideology mid-game. I know you can, somehow...

Anyway, we can't eat the rich because the rich are usually cyborgs and therefore inedible; but we can disassemble them and turn our own people into cyborgs.