Okay, I get everyone saying one should be a motorist but I did read a story where a young man, around 19 years old, unable to have a car was sent out to deliver some homemade food to relative and took the bike and indeed got mugged on the bike.
There’s also such things as car repairs and just plain other reasons, saving money, one might not have a car to use, it happens.
I use the bike frequently but I’m over all supercautious and I don’t really go with the fancy clothing, shorts like underwear and all of that, yes, I’ll get on the sidewalk if need be, walk the bike if need be. And I’ve largely stayed out of riding in so-called dangerous areas though one time, though not endangered thank goodness, I was in a rough area. Live and Learn.
A lot (not all) of bicycle naysayers are so fat, lazy and/or out of shape that they have to drive 1/2 a block for a donut instead of walking or riding.