All you can do by changing your diet from meat to plant is a gradual change. You kill less and do less harm, which is great. But you still kill and do harm, that’s just how these things are.

True. The difference is between calling it good enough halfway or going as far as possible though. So they do have a point, although I agree that (like in every other group of people) there are some that are a little over enthusiastic and in danger or turning people away instead of encouraging them.