Humans are omnivores, we eat anything, if it can be digested we will have a go at it. To say that we will eat only plant resources goes against basic human nature. Forcing people to act against the way we are wired doesn’t work. This is kin to the same lame thinking as radical communism.
Some years ago I was eating Thanksgiving dinner at a friend's house when the topic turned to vegetarianism (don't ask me how). My friends step-son, eighteen years old, started talking, and he had heard that humans only started eating meat about ten thousand years ago because of a huge famine. There was not enough non-meat available, so humans had to resort to eating meat he stated.
I just about spit the turkey out of my mouth when I heard that. I asked him where he had obtained that bit of info. He didn't know for sure. I told him humans had probably been eating meat for millions of years. He didn't look like he wanted to believe me, but if he believed that nonsense about humans only eating meat for the last ten thousand years, then he had probably heard a lot of vegeatarian propagand i.e. lies.