Our current "I can do what I want" culture is accelerating beyond what I ever imagined years ago. These motorized bicycles do NOT mix with pedestrians or regular bicycles. Speeding on motorized bikes is inevitable. When these "bikes" are allowed to proliferate on human powered pedestrian/bike paths, you simply are asking for trouble. The mostly younger motorized bike riders are not thinking and are generally terrifying. I was recently in Cal. riding the SA riverbed bike trail as I always do out to the water when a 4-pack of young punks on high powered E-bikes thought it a good idea to play chicken with me (with zero traffic on the trail at the time). One of these poorly-raised Hodad idiots came straight at me in my lane with a giant smile on his face at 25+mph. At the last possible moment he pulled back into his lane, laughing the entire time. Wow, that was close.
He missed me by inches. It was certainly an eye-opener. Next time, my straight-leg jousting technique will be employed in order to instantly dismount the offending pilot, allowing me time to subsequently rip out any exposed electric wiring from the machine before ceremoniously throwing it into the jagged granite rocks lining the channel. I have had a few other events on the SA river trail with these young punks. They pass you really quickly, then do donuts in the dirt on the side of the paved portion so you have to eat their dust. They are really good at making sure you are riding in a dirt cloud, timing their spinning donuts perfectly.