I speculate that American culture is about self-independence from safety regulation. I should be allowed to eat Frosted Flakes, yes I can know that refined sugar is not-good for me but they, "TASTE GREAT!" and thus we have the Modern American Diet (MAD) and it's unavoidable consequences.
Adoption of transit paradigms (for example - protected bike lanes) is a non-linear function that has little to do with rational policy making. What is the pathway you are aiming for and what is data that will help you answer it?