Cannabolism is better than murder because when you kill your victim, you get free food out of it, amirite?

Cannabolism sounds like the process of metabolizing Cannabis.

"Cannabolism"? What's that?

And if the cannibal decides to eat their victim's brain, there's a high chance they get a lethal prion disease so the problem of having a cannibalistic serial killer running around solves itself eventually.

It's spelled "Cannibalism"

And some would argue that killing humans to eat them is even worse than plain old murder

this didn't come out better than your first attempt.

I don't know if I would call it "free food", as the price of said food was someone's life. If you eat naturally-passed granny, however, you're simply getting the food before the greedy bugs, bacteria, etc. who wait for her at a depth of 6 feet..

Also, who says the meaty bodies have to be dead at the beginning of the cannibalism? If you use living-fingers as appetizers, any murder of that person would be merciful, and better than the cannibalism.

Hunting for sport is trashy but hunting for food is understandable. You've got a point.