I reckon that it's just a matter of time before nanny states like Massachusetts pass a law requiring helmet use for running. Therefore, I dusted off my old Bell from the early 80's when I used to ride a Moto Guzzi and wore it throughout today's 7 miler. I've got to admit that it wasn't so bad. It successfully deflected debris hurled towards me by teenagers waiting at their bus stop. It shielded my forehead as I ducked beneath heavy branches and it kept my ears warm.
I'm preconditioning myself by wearing it now so that whenever that inevitable day comes, I will be ready. You folks, however, are on your own.