The correct response is to quietly note the people involved and find out where they live and work. Then have have polite, private, parking lot conversations with them, away from media, to express exactly how you feel about what they are doing. Once that happens often enough, or word gets out that it is happening to people like them, then I'm sure these people will be persuaded that what they are doing is wrong and they will quietly step back from their "activism".

The fight isn't against bad ideas, the fight is against the people who hold those ideas. Ultimately those people will have to be exiled because the religion that has taken hold of their psyche will not allow them to let us live in peace.