And any discussion that tries to frame them as somewhat equally important issues is dishonest and either malicious or delusional.

My guess, as I've expressed earlier in the comment chain, is that it's emotionally easier for people to bike-shed about the 0.01% of their environmental impact, than to actually tackle things that make up 20%.

And no it's not only beef (which is a stand-in for meat and diary), another low hanging fruit is also transport, like switching your car for a bike.

But switching from meat and diary to a vegan diet would reduce up to 20% of your personal environmental impact, in terms of CO2.

And about 80-90% of rainforest deforestation is driven directly or indirectly by livestock production.

So it's simply the easiest most impactful thing everyone can do. (Switching your car for a bike isn't possible for people in rural areas for example.)