[Tomte]

They are a rather big and rabid group on Germany.

Another argument by them: sure, having your skull split open when falling and hitting the head on the pavement is bad, but it's really bad when you're falling and instead of a clean hit, your neck is subjected to particularly strong rotational forces due to the helmet enlarging your head, thus moving the point of impact outwards.

They are a nasty bunch.

[stevenh]

You supplied pejoratives, but not a single counterargument.

[Tomte]

I did: having your skull cracked open and your brain distributed on the pavement is certainly worse than having some strain put on your neck.

Both can be lethal. The former is very much so, the latter usually not.

No-helmet crowd claims the severity is the the other way around.