Wow well done you are very heroic in your struggle against the oppressive over bearing regime of that school and your victory shall reverberate down the book of history.
Your name shall be the battle cry on the lips of the self-righteous forever more.
Wow, you really are up yourself.
If you'd bothered to read the thread, you'd see that the mini-Puddles do wear a helmet.
The issue is that the head is exceeding their authority. What right do they have to dictate what safety measures parents choose to take outside school property when the child is not under the school's duty of care?
This is no different to the school demanding that pupils walking around the village always wear high-vis tabards, even in the evenings and weekends.
Or the school sending evening and weekend meal inspectors round to check parents are not feeding their children unhealthy meals.
And as others have said, they do not insist roller-bladers or scooter riders (or pedestrians, come to that) wear helmets, so why not?