Yes, but personal risk per kilometre travelled and person involved in the activity is far far lower for both. Which is why it's recommend the people taking the higher risk wear the helmets. And in cases where pedestrians are at higher risk, for instance people with brittle skulls or coordination risks, they do wear helmets.

Re: velocity, yes, if you're getting hit by a car in the head, you're a goner, however, there are other ways to hit your head coming off a bike, usually at speeds of 20-30 km, which pedestrians rarely experience.

But you know both of those and are just trying to be disruptive by misapplying numbers, aren't you? Luckily, it's a personal choice (in the UK at least) and if you want to risk brain injury, go right ahead.