Frankly, I haven't experienced any more reckless or murderous drivers on my bike than in my vehicle. Lots both places. But the overwhelming majority of the vehicles I meet, motor or pedal, are courteous and easy to get along with.
Admittedly riding a bicycle next to or in vehicle traffic can be intimidating and lead to paranoia. At the same time there are days when I'm forced to do a lot driving that I could swear they are out to kill me.
Fact is there are a lot of mentally disturbed and/or limited people out and about. My goal is not to become one of them.