Hmm, that's a great point. It reminds me of fandom groups where most people are just trying to have fun and enjoy the fan content, but then a vocal group of unpleasant people will also designate themselves part of the fandom and damage its public image.
In that situation, the only thing that really seems to fix the public image of the group is having an authoritative leader (such as a creator of the original work, or a fandom conference organizer) making a public statement like "We do not condone persecution, we support the right to abortion, LGBT+ people are welcome at our fandom conference, etc".
Tying back to the original topic, maybe the equivalent would be if well-known Christian leaders were to make statements like that?