Rebecca Solnit’s essay “On Not Meeting Nazis Halfway” is excellent.
…the truth is not some compromise halfway between the truth and the lie, the fact and the delusion, the scientists and the propagandists. And the ethical is not halfway between white supremacists and human rights activists, rapists and feminists, synagogue massacrists and Jews, xenophobes and immigrants, delusional transphobes and trans people. Who the hell wants unity with Nazis until and unless they stop being Nazis?
If half of us believe the earth is flat, we do not make peace by settling on it being halfway between round and flat. Those of us who know it’s round will not recruit them through compromise. We all know that you do better bringing people out of delusion by being kind and inviting than by mocking them, but that’s inviting them to come over, which is not the same thing as heading in their direction.
Appeasement didn’t work in the 1930s and it won’t work now. That doesn’t mean that people have to be angry or hate back or hostile, but it does mean they have to stand on principle and defend what’s under attack. There are situations in which there is no common ground worth standing on, let alone hiking over to.