First let me reassure you that in EVERY SCHOOL there are those two people that could just drive one nuts! I am lucky enough to have survived one mom that I never really did understand our friendship but I learned so many do's and dont's!
If you are a K-6, you may not need to disban is they are getting ready to move on....if you are a K-12 you could also just hope they get tired of "fighting the fight" (yeah, the one THEY started
) and be given the chance to move on.
It could happen with no moneys flying either!!!
As far as the Principal, I have seen it and survived the same issue with this mom. She just felt that and could not understand why she could not know some of the craziest information. Now it's funny secruity was mentioned. We have to be buzzed into our school, a proceedure that was put into place as we are in a business area near a gas station. At our school THE only doors you can enter during the day from the outsdie are the ones with the buzzer. Getting out of the building is much easier than getting in. This mom was so mad and crazy over the whole thing. Funny thing, when a man carring a gun two blocks from the school, was on the loose, our school was in lock down, and now those front doors weren't such a bad idea. They have also come in handy with irrate parents that start their visit verbally abusing the front office staff.
At any rate, you could disban ( with the hope they don't join or take over that effort); pray for graduation; OR ban a group of parents together to vote out these parents.
Just keep doing what you do best and keep yourself above the "yuck"....I would rather Queen of the flower garden that King of the shitzu pile!!