Not everybody agrees that beef is bad for you and the environment. We were talking about human health, it's hard to find a more of bioavailable source of nutrition than animal protein and fat
While I acknowledge the concept of a "carbon footprint" is complete BS, beef production does have a very high impact on climate change. Just want to point out that fact. I still eat it from time to time though. Yes, beef is high in protein and tasty.
As an aside, I believe as environmentalists, we shouldn't shame people for doing the "wrong" things IMHO as even the best of us still contribute to the problem in some way. Everyone has their own reasons for doing what they do, and shame doesn't often change minds. Personally, I try to take my own small steps, but I'm not prepared to live like a hermit. I do try to eat meat less often, and I volunteer a considerable amount of time to lobby for more climate friendly policies. This course of action is what works well for me.