I am not saying that we should kill politicians.

Killing politicians is illegal and could send you to prison.

But I will say that if it is unethical to kill any politician no matter how bad the policies they set then it is also unethical to kill farm animals for meat and not as a matter of self defense

One can eat animal meat without killing an animal. Not eating meat from an animal that is already dead will not bring a animal back to life that you did not eat.