An elderly gentleman in my locale made himself a trike with 3 wheels in front. He rode at less than a walking pace, but was out all the time. I made a mental note for if and when I can longer get around on two wheels.
I believe you meant to say "after a few injuries and a moral panic originating among demographics that don't tend to expose themselves (moreso their kids) to risk of injury very much."
Nobody cared when farmers had three wheelers. But at some point as they moves in from the rural areas to the exurbs and into the outer suburbs and a line was crossed and they went the way of lawn darts.
I wouldn't want a three wheeler as transportation but as entertainment or a utility vehicle they're fine, not stupid proof but fine.
I’ve looked at Arcimoto too, but being in NYC with something like that just seems like asking for a bad time