Like the British Empire at its glorious, tea-stained peak, the sun never sets on the helmet war.
In the trenches of a comment section somewhere, ranks of libertarians aim their vitriol guns at an endless column of muddy volunteers willing to die for head-protection.
Get in there. Doesn't matter what side. Pick your weapon.
If you like the wind in your hair, assert that helmets are ineffective in the same serious crashes that are most likely to hurt heads.
If you like the nylon strap under your chin, you should load up the anecdote cannon ("My dad cracked his helmet in February '85 and he says it saved his life.")
Aim to kill, and remember, war is hell.
BONUS TIP: No battle in the great helmet war can be said to have really begun until one group of cyclists wishes death on the other. Drop that bomb early.