Face masks keep bugs out of your immune system, too! (Don't believe the chart? ask the surgical team who dons face masks before putting you under the scalpel)
But yeah: a helmet would have the advantage of also protecting the precious noggin' from a much quicker and more easily imagined death. Being forcibly ejected from a motorcycle, I'd imagine, has a somewhat lower than 99% survival rate.
lol it seems liberal memers on this steam can't even attack libtards without being called lefty. :)