Helmets for all cyclists

My son recently fell off his bike on the way to school. He fractured his scaphoid, was covered in grazes and bruises but he also banged his head on the kerb. Thankfully he was lucky and only got a lump, a graze and bruises but it couldn't been so much worse. He was told off by numerous healthcare workers because he wasn't wearing a helmet and his reply was, "I only have go to a short distance". The truth is its not cool to wear a helmet when you're a sixteen your old boy because it might mess up your hair! If it was made law, it wouldn't matter about looking cool because everyone would look the same. Jake was lucky but it could've been a different story and he could've suffered massive head injuries.