You do understand that voting for the person you want is a vote for the person you want and not a nonvote, right?
Additionally, where is the line? The Democrat wants to do the trans genocide just as much as the Republican candidate. Your vote is also a message to both mainstream parties. Voting for the Democrat will signal to the dnc that being anti-trans will break the losing streak. Voting for the Republican will do the same, because the dnc are always chasing the non-existent "centrist Republicans".