It was similar with gay right. Marriage rights, parental rights and such were driven first by "born this way," argueing that sexuality is unchangeable. Then, it came via normalisation as people came out and your friend end turned out to be gay. Eventually people concluded that homosexuality is fine, not a vice. "I think it's wrong, but freedom" only plays a role after the gay rights side wins. The dissenters can console themselves with it and put the issue to bed.
That doesn't mean no one actually idealises freedom, but it rarely adds up to political change.