Heinlein did not promote extreme freedom in general, he promoted extreme freedom for his male main protagonists while everyone else had to subject themselves to their ego trips. I distinctly remember a scene where the main protagonist's lover disagreed with him (gasp!) and virtually had to beg on her knees for forgiveness.

All the self righteous "libertarian" anti-government crap may seem to promote freedom, but it's really just replacement of an inconvenient authority (government) with a new one one (Heinlein's avatar in the story) which is conceived as perfect and allowed to get away with far more shit than the previous one. And that sounds damn close to the fascist Führerkult.