I read the email exchange. Even though the parents had legitimate concerns, they behaved like arse-wipes.
As for being arrested, he was essentially staging a sit-in strike when his demands weren't being met. He was warned that unless he left he would be arrested. I'm not sure why he should be surprised at actually being cuffed.
This whole thing could have been more reasonably dealt with if the parents had 1) cooperated with the principal when she offered a meeting (instead of launching into harangues) and 2) the Father consulting legal advice instead of staging the sit-in strike that got him arrested.
Flame away. I call'em like I see 'em.
Fine, then publish the names, faces, and home addresses of the arresting officers. See if they can stand the heat.
The school administration should be in prison.
Do you have a link to the e-mail exchange?