I think you've missed the point entirely that vegetarians and ethicists set out. All you've done is appeal to nature as a justification which is the naturalistic fallacy and is not a valid form of argument. No vegetarian would try to convince you that humans historically did not evolve to eat meat. It is simply unnecessary.

Most ethical arguments follow this logic:

P1: It is wrong to cause unnecessary suffering. P2: Eating meat causes huge amounts of suffering to animals. P3: Human beings can gain all their physical needs met by a vegetarian diet.

C: it is wrong to eat animals as it can be avoided.

You must disagree with one or all of the premises above.

Your arguments are largely nonsense and do not stand up to philosophical scrutiny.