Your fear about what might happen to you, expresses as anger to people who self-sacrificed. So you call them stupid. I don't agree with their act of sitting out, but their act was absolutely not "stupid," ableism aside.
It was an intentional, conscious act. Nihilistic? Yes. Suicidal? For some, quite literally, yes. But from their position, it was rational.
This isn't "Jill Stein voting" or privileged folk who won't be impacted. This was self-immolation while hugging their enemy.