>eating any meat is morally questionable. (I say this as a person who does eat a lot of meat).

I think this is very wrong. Doesn't account for when you don't have a choice, to be healthy. You need to eat more, you need to consider all possible situations, construction work people need to sustain all that physical labor somehow. It's a more serious chore to even attempt to build a non meat based diet, let alone sourcing everything.

If we could have a healthy alternative that accounts for everything (taste included) then maybe you can make that argument. Until then it's quite shortsighted and ignorant.