Humans weren't designed to eat meat - simple as.
We have the same biological make up as Gorillas, who are HERBIVORES.
They have canine teeth too, before you try & pull that one - and we have long intestines, no claws, chew rather than swallow (we don't use our canines) and walk upright - all traits found in herbivores.
We may have scavenged meat in times past, but we certainly didn't start hunting it until we developed tools to do so.