Two years ago, I gave up riding on the road alone. This isn't really an issue as have tons of group rides, gravel rides, mountain biking, MUPs, running to do.

I gave up riding alone because I got hit by a car and decided it wasn't worth it. Only a very small minority of people driving are irresponsible jerks. The much bigger issue is that there are too many people out there that don't take driving seriously enough, lack situational awareness or distract themselves while driving. Lots of people just don't look. Lots of people have terrible spatial sense and lots of people lack common sense. They pass too close because they don't know how wide their car is. They sloppily cut corners while turning because it takes more effort to turn properly. They fail to recognize and prepare for possible dangers. They are surprised by any non-car user of the road. They lull themselves into complacency behind the wheel and tune out. They sort of drift around aimlessly on the road. I see it while driving as well as when I'm riding a bike.