Veganism is an individual choice, and individual choices are generally pushed by culture
Of course culture and politics influence each other in a myriad of ways, but when people start to try and push individual choices like being vegan into the political space it is never very popular
I personally would fight tooth and nail to prevent veganism from becoming a law in my country. Failing that I would immediately make plans to move somewhere else.
That's not something most countries want
It's tied to their identity for a lot of people. The same kinds that will drive a huge SUV to compensate for the hole in their lives where meaning and connection is supposed to be.
The broken US voting system amplifies the effect.
They already told us. They hate anybody who isn't a cis white christian male. There's not a lot to find consensus on when one side wants healthcare for everyone and the other wants some people to cease to exist within the country.