Primarily because sometimes people want a burger and not have to have a cow die to get it. Another reason is that red meat is known to be carcinogenic and hard

Primarily because sometimes people want a burger and not have to have a cow die to get it. Another reason is that red meat is known to be carcinogenic and hard on lipids and while their isn't sufficient data on plant based meats the going assumption that it is at least modestly better is probably a reasonable one. But yes, non-processed plant based food is terrific and probably the best for you.