I would posit that the self-identified "cycling community" is about the same percentage of "people who ride bikes" as programmers are of "people who use computers".
We're a long way from everyone who buys their kid a first bike at Walmart knowing about balance bikes (or the cheaper option of taking the pedals off)
Some people wear helmets, but generally it is considered to be such a nuisance (where to leave it, uncomfortable, unnecessary, messes with hear, can't wear a cap) that it may even impede bike usage and make bike less desirable over time. It's certainly not illegal here. There was some research [0], but it's becoming a thing more and more I have to admit [1]. But generally our infra is probably much safer than you can imagine if you've never been here [2]. Also we go quite slow on on our normal bikes (many don't even have gears), we de wear helmets on racing bikes and while mountain biking.
Also, ebikes are making it more unsafe by easily going twice the normal speed, and we need to have a public discussion about that. Many ebike riders do wear helmets, especially the elderly.
[0] https://swov.nl/en/fact/bicycle-helmets-4-why-do-cyclists-ch...
[1] https://www.reddit.com/r/bikecommuting/comments/dwca9c/why_d...
In the US perhaps, where I live the whole cyclists vs non-cyclist thing does not exist. Everybody is a cyclist (perhaps the US is a car community ;)), but generally in normal clothes, on a normal bike (not racing, but like this [0]), with no helmet and on bike lanes where you never meet a car. The smallest bikes (12 inch wheels) are rated 2-4 years old.
[0] https://duckduckgo.com/?q=cortina+u1&t=ffab&iax=images&ia=im...