I think it was far more widespread than you think.
Widespread is relative. Compared to before, it was very much widespread. But overall, it was still not popular or mainstream at all.
But it is also the case that people in Minnesota, Iowa, Missouri, Texas, etc. were all listening to what was being released from the coasts.
Sure, but this was during a time where even within the left or left leaning spaces, homosexuality was seen as a controversial and often negative thing. Even if somebody was sympathetic to some aspects of the "hippie movement", that doesn't automatically mean that they were accepting of homosexuality.
widespread experimentation with marijuana
Yes, experimentation with recreational drugs definitely exploded, but I don't think that just because people tried pot doesn't mean they were all ultra-leftist pro-LGBT activists.
In the days when pre-marital sex was taboo, many couples had at least one powerful incentive to marry.
Yeah it was the norm that pre-marital sex was taboo, that doesn't suprise me at all. But as is often the case, many people still engaged in pre-martial sex, they just did it in secret. And the same was sort of true for the LGBT community because homosexuals and transsexuals have existed before the 1960s, they just existed on the edge of society.
1/3 people saying it is acceptable probably indicates a far greater amount of people thinking it is somehow cool - like how being in a biker gang is cool, or like how being a drugged out disco burnout or hippie was also cool.
But those people were not seen as "cool" by most people. Yes, there was a certain fascination with both the hippies and biker gangs as they were seen as outlaw rebels in a sense, which has some coolness factor, especially in America where the "rooting for the underdog" narrative is baked into the culture. Homosexuals were not seen as cool just as trans-people or non-binary people today are not really seen as cool in the same sense because they don't really fit the rebel image.
Bikers and hippies were opposed by conservatives because they believed them to be revolutionaries who are threatening the system and causing instability and lack of order. Homosexuals and the LGBT community are/were opposed by conservatives because they are seen as degenerate, perverted, unnatural and weak.
That's exactly right. Crime, punishment vs rehabilitation and the prison industrial complex are big topics on the left. Nowadays, it's popular even for people on the right to criticize the "prison industrial complex", but the left has been criticizing it since at least the 70s. The most radical leftists even argue for the abolishment of prisons and pretty much every leftist advocates at least for prison reform and focusing more on rehabilitation as opposed to punishment.
Yes, I would say oppression is generally a bad thing. To explain further, I would also say that people shooting people is generally a bad thing, but I think we can all agree that in some special situations, people shooting people is a "necessary evil", for example when there is no other option and you need to defend yourself. I still don't think you shooting someone in self defence is "good", I think it's a situation that sucks for everyone involved, but you had no other choice, it was necessary and the best possible option.
I look at prisons in a similar way. I don't think people should be locked up for non-violent crimes or in cases where they are clearly not a danger to anyone, I don't think people should be tortured in prison as punishment, but I do think that in order to protect the lives (and personal freedom) of other people, we need to sometimes separate dangerous people from society.