They just need the school board to cave to the constant annoyance. The community only shows up when the bad decision is imminent (or, often, has already passed) because they cannot treat this issue as their only #1 priority, as a small group can.
What the school board did here is sneak out of the battle, which would continue long after community says "no" once.
I dunno I agree, it's at least not been my experience with these types of parents over 10 years in my local meetings. Again - if you genuinely think children are being harmed in your community you're unlikely to care Jim from down the road doesn't let you borrow his tractor anymore (or whatever).
Maybe it's not something that can be said for every community, but the same point would apply here in reverse.
I'm not saying their feelings aren't sincerely held. My point is they need community support to ban books in a public school.