"Who gets to establish the standards for a community? The majority or the minority?"
I'm still wondering where you got the idea that it was a minority of parents.
I'm also still thinking that this was an article from Agape press. Agape press has an audience that would see this as newsworthy. Just like the masses of people who have already pulled their kids out of public schools, thinking they can no longer be trusted to be a good environment for children or teens, many in Agape's audience will consider this story of being worth their consideration and possibly store it away in their memories where it may affect future decisions, such as how closely to monitor a child's education.
If these parents are unhappy with the school board's decision there is no moral or political principle that should stop them from letting it be known to others or from taking other actions, such as pulling their kids out of the school. Maybe they will go on to try to make sure more parents in their school district are aware of the situation. Maybe one or more of them will run for the school board in the future. These are all valid actions for concerned citizens to take.
I'm still wondering where you got the idea that it was a minority of parents.
I googled the news story. It was actually one guy according to several accounts in the local papers.