Why not just fall into line and leave the school more time to get on with educating your son? When he grows up and gets a job he will face similar situations and sometimes the best answer is to comply and get on with other stuff. He'll have his day. Maybe one day become a teacher.
They'd have more time to get on with educating my son if they didn't waste time dreaming up, implementing, and then enforcing misguided and counterproductive cycle-helmet rules.
Why not just fall into line and leave the school more time to get on with educating your son? When he grows up and gets a job he will face similar situations and sometimes the best answer is to comply and get on with other stuff. He'll have his day. Maybe one day become a teacher.