You're welcome to wear whatever you want while riding your illegal whatever-you-call-it. Don't scold the rest of us.
0. Ivers R. Systematic reviews of bicycle helmet research. Inj Prev. 2007;13(3):190. doi:10.1136/ip.2007.015966 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2598379/
By the way, helmets on bicyclists tend to make car drivers behave like even bigger jackholes than usual. https://psyarxiv.com/nxw2k "... public health research might be best served by shifting focus to risk elimination rather than harm mitigation."