> as John says, you have a third option... don't vote. You don't have to vote on every question and answer posted here. When you downvote because something makes you uncomfortable, you are hurting the person who has asked the question... they already admit in the question that the subject is somewhat taboo.
When you judge them in your voting rather than judging the question quality or topicality itself, you're signaling, in another place, that they are not welcome. The SE I love is not that sort of place