Yeah, but talking about beef is more about it being a good first step for people to take. Removing one thing from your diet that can easily be replaced, makes it easier for people to start their journey.
Also, ethics is weird to bring and discuss in this issue, because... "What's worse"?
50 male chicks fed to the grinder alive at three days old, plus their 50 female cousins living in hell for 4 months until being asphyxiated alive, for meat,
or
four cows being chain-machine-raped, made pregnant, and having their children immediately taken away from them repeatedly, in order to keep the cows producing milk, unmoving and sick, throughout their 5 year life until slaughter?
It's all a criminal tragedy. I don't think it makes sense to compare them, comparison will never make sense, it's all arbitrary.
What is not arbitrary, are the methods to wean people off of the habits that feed those industries, and the methods to reduce those industries' political power.