When all of the candidates on a ballot are going to actively work against my values, why would I vote for any of them? That said, I have written in choices before, but it's a lot of work to do when literally no one will be taking notice of that vote.
Because one and only one of them might put you in a prison camp, and destroy the machinery by which you might ever hope to elect someone who would align with your values, without having to fight a war for it?
Or maybe, "only" deport 18 million people who didn’t do anything. But hey! If none of those 18 million is you or your family, that’d be okay. And you got to make your statement.
If I really cared about making a statement, I'd put more effort into regularly heading into polls to write-in my choice. I still would not be voting for either of the major parties.