[RationalDino]

That is true. But in the early 60s, before the rise of the Religious Right, no such association existed. For example https://www.pbs.org/thisfarbyfaith/journey_4/p_2.html shows the strong Christian support for the Civil Rights Movement.

Also it wouldn't have mattered back then. In the early 60s, drugs were associated with neither conservativism or liberalism.

Anecdote time. My ex's grandfather was a very conservative, very Christian lawyer. He happened to also be a lawyer for some people who were involved with LSD in the early days, and hence actually tried LSD in the time frame of the research article in question. He used to laugh about how he was someone that nobody would think had taken LSD.

It was a different time.