What is the logic behind having your kids wear the comfortable, lightweight, reasonably priced helmet when riding a bike, but not when jumping on the tramp? I seriously am wondering.

And by the way, I'd be okay with the answer that it would turn your child into a social pariah to wear a helmet while jumping on the tramp (we all do lots of things because of social pressures, and anyone who says they don't is a liar). If that is not the answer, I am honestly trying to understand the logic.