There was a focused effort to "professionalize" the hobby by researcher (crank) John Forester. Thousands of cyclist deaths can be attributed to his efforts, which included promoting "serious" cycling over accessible and casual transport, and personally destroying early plans for widely-available bike lanes in California a la in the Netherlands. Though not as infamous, you can think of him as a mini Moses.

Wow, I had read his book but had no idea that he was so influential pushing efforts to remove separated bike lanes in California.