Less of this, please.
Don't get me wrong, I've got both a car and a bicycle, not 100% for road cycling but count it as if it was (it's a gravel bike.)
For me cycling beats running 100-0. I can easily pedal 100+ km but I can't run 100 meters, too tiresome. Furthermore I see 100 km of the world vs a small area around my home.
Ultimately it's all subjective. Each of us likes something different and it's OK.
It is fine to speculate, but "must" is a strong assumption. Your analogy is also based on flawed data. Yes, when riding on streets there is a chance of getting killed, but getting regular exercise reduces your chance of dying for other reasons. There are many studies that demonstrate this. Here is one:
https://www.newscientist.com/article/2237214-why-the-health-...
https://www.bmj.com/content/357/bmj.j1456
Tell me what you think the benefit:risk ratio is of doing jumping jacks at a gun range.
I have worked from home for a long time, but 15+ years ago I commuted by bike about 12 miles each way three times a week when the weather was good. Dominance had nothing to do with my choice to bike there.
I could ride there by bike in 45 minutes, or I could drive there in 25 minutes (lots of stop and go). Same on the return trip. My mental calculus was I got 90 minutes of exercise for an incremental time expense of 40 minutes. That I was also not polluting was a bonus.
The nearest accident I had ever was one day when I was on connector road that had recently been widened and hadn't yet picked up a lot of use. Despite there being no traffic at that moment, I've always 100% obeyed traffic laws, so I stood over my bike waiting for the red light to change. About 20 seconds into it a pickup truck came screeching to a stop just about five feet behind me - he literally locked the tires and left skid marks. Guess what his reaction was: to shout and scream to the point of spitting that I was lucky to be alive and that I wan an asshole for biking on the road. I still don't know if he saw me all along and it was a calculated dominance display, or if he was daydreaming and really did nearly cream me.