They were so close. Instead of taking the boys away a few minutes early they should've taken the girls away early. If you ignite the fire under their butts at a young age, they'll push for equality so hard, by the time they become adults they'll already have an established following and possibly credible record to stand on to take some serious action.

This is why feminists get a bad name sometimes. By punishing the boys, this becomes an us-versus-them issue, and this staff probably thought they could "chalk one up for women" that day. The problem is the scorecard is at about 100,000 - 10.

TLDR: If they had shortened the girl's recess time instead of the boys, they would've had the opportunity to show women their expected reality in the world. Instead they forced a gender battle between children.