I'm going to take a guess here that you're in a bubble. Most people don't give more than a passing thought to protecting anybody else on the road but themselves and their own loved ones. You could say enlightened self interest means this should extend to random strangers, but I bet that as a practical matter it does not. I'd even go farther and suggest that the largest plurality of people who support public transit want it so that it will take other people off the road, not them.