I overall agree that the argument isn’t enough to move the needle.
I’ll just say that I think 90% is too high for people who don’t care about about how much meat they consume. I think people’s views on the issue are more complicated. I think there’s a large group of people who have a general notion that eating meat is unfortunate, but don’t reduce their consumption because it’s not a thing for their ingroup, and also they bristle at the notion about someone else telling them what to do. Kind of similar to how lots of people think that their clothing is made unethically in sweat shops, but they buy it anyways.
If I had to choose a number of number of people who don’t care how much meat they eat, it would be closer to 55%-60%.