Most places are not set up for bikes. Bike lanes are largely an afterthought, placed between traffic and parking, making an accident all but inevitable.
You can basically run over a cyclist and kill them with few to no repercussions, because we just don't have enough safeguards in place to protect cyclists from drivers driving off, never to be heard of again.
The vast majority of the US is not cyclist friendly, it's a hazard.
Edited to add: Here's a simple basic proposition. With curbs each between cars / bikes / pedestrians.
I watched and read it all as a kid, I've put a few episodes for my own kid recently and I was totally shocked at how much of a perv he is lol it would clearly not fly nowadays.
Roshi would only wear a helmet to protect damaging whatever his head happened to hit and not the other way around. Because we've seen him riding a motorcycle with nothing but one of those James Dean hats.