Originally Posted by
Six-Shooter
... Doubt you'll find many takers, though

That's because people have their own sense of what their personal risk is while doing those things and feel a helmet isn't required, just as some cyclists do
Probably more realistic to make sure your shoes are tied, avoid slippery patches or uneven ground, and pay attention to where you're walking. I've seen/known multiple people to suffer serious injury from falls merely because they, by their own admission, weren't paying attention to what they were doing.
and the same things apply when on a bike. Make sure the bike is in good condition, avoid slippery patches, and pay attention when you're riding.
I've also seen/known multiple cyclists suffer serious injury from falls merely because they, by their own admission, weren't paying attention to what they were doing.