Your actions have effects in the real world! Shocking, I know. But not voting for the lesser evil in a FPTP voting system like the US’s increases the likelihood of the bigger evil winning.
You don’t get to deny responsibility, however minor, for the consequences of your actions.
How about being a compassionate human being who tries to understand the conversation partner’s fears without bowing down to misinformation? If that’s not enough for them because they see debunking their bunk as personal attack, I don’t think anyone from outside of their cult is an acceptable conversation partner for them.