What's the Point, Again?

So, there's this guy I see around base sometimes. He wears a helmet when on a bike, as is required. He does not, however, buckle it under his chin -  instead, he wraps the straps around the helmet itself, where it rides precariously on top of his head.

This kind of baffles me. I mean, I know there are plenty of people who choose not to wear a helmet because it isn't "cool", and there are even more who don't seem to know how to fit it properly, but this is an outright worthless way of wearing a helmet. As soon as the guy crashes, the helmet is going to be long gone before his head  hits anything. At least if the straps were hanging loose (like way too many kids around here wear their helmets) there might be some hope of it hanging on and providing a little protection.

As a person whose been in more than one bike crash, one of them being a head collision where a helmet saved my face, literally, I'm unimpressed with the faux headgear that fulfills the rule here, but does nothing to actually fulfill the reason it exists...