Pscyclepath always says there are two kinds of cyclists- those that have had wrecks and those who haven't yet. This is his argument for helmets.
I had my wreck back in college- borrowed my roommate's bike -it was way too small for me- I got my knees tangled in the handlebars and flipped over said handlebars. Took the Lord's name in vain- right there in front of the Baptist Student Union. Ended up having a few stitches in my head.
Even though I've had my mandatory wreck - I do always wear my helmet- I promised Momma & that is now enought to make me behave.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort.