Yeah but people need food, people don't need hundreds of flights on a private jet each year. One problem is easier to solve than the other so we should start there.
Animal agriculture uses more food than it produces. You need to feed the animals and the meat they produce is considerably less food than what they consumed.
Sure the 0,1% polluting 1000 times as much as average people is really shitty but just cutting their emissions down will not solve the problem
Making huge changes among the population is necessary, too.
Obviously you need to tackle the rich, too, in order to get the population on your side but for laws to happen you also need a decent part of the population already agreeing with that law and living by it.