The opposite could easily be argued, that holding onto taboo is what makes it difficult for victims to seek help and what allows predators to act unabated.

The most sexually repressive societies have some of the worst sexual sociopathic behaviour, I don't think I need to give examples.

Those preaching sexual liberation were the ones who fought and won the battle to incorporate homosexuality into our social norms.

No. In fact it turned out that gay people wanted to be like straight people. They wanted weddings, marriage, the ability to hold hands in public, to adopt children and so on. They didn't want "sexual liberation," they wanted their relationships to be accepted the same way hetereosexual relationships are.

Being gay or accepting such was a part of being "sexually liberated" back then. Just as being into kinks is a part of being "sexually liberated" now. I don't understand why you insist on conflating it all to marriage and children (or lack thereof).