Well, maybe, and that sucks, but it also doesn't really matter. You're still burdening thousands if not tens of thousands of groups with a significant legislation and cumbersome procedure just because there's this one group in the bible belt that might be a bunch of jerks. You can't really legislate jerks away.
And regardless, I don't think public resources should only be available to "nice people", or "non-toxic groups" (whatever subjective meaning you can give to that). It really doesn't cost a lot of money to provide and manage some venue for public use, and "funded by tax dollars" is more of a hang-up than anything else. Tons of public resources are funded by tax dollars, from pavements to social services to the fire brigade. Jerks and groups that are a bunch of jerks have just as much right to use these resources as anyone else. This line of reasoning becomes pretty absurd fairly quickly.