They still can buy from meat from ethical sources like small farms etc they just should avoid big companies that serve your meat directly from cattle concentrate camps if they like meat. For me it is no sense to eat at daily basis those products yeah I can understand that some times there is need for a burger with friends and in damn Burger King or similar your only option it is plant based whopper or nuggets, but I really can’t understand why vegetarian people go and look everywhere for those substitutes if they have plenty vegetables/dairying products that can be much better for you overall health than those heavy processed proteins. The reality is they like how easy is to prepare those things and that is no brainier, you can archive same results using spices and marinades.