It's a great book but Heinlein is generally considered right wing not left I thought ?

According to wiki while he started off leftish he was quite conservative/libertarian by the time of "moon is a harsh mistress"

https://en.m.wikipedia.org/wiki/Robert_A._Heinlein

"yet Heinlein became a hero to libertarians: Milton Friedman praised Heinlein's 1966 novel The Moon Is A Harsh Mistress, which chronicled an anti-statist rebellion on a lunar colony, as a "wonderful" book and commended Heinlein "

https://gizmodo.com/how-robert-heinlein-went-from-socialist-to-libertarian-1588357827

Edit to add

Having read the gizmodo article again it seems a more complicated shift than a simplistic left youth, right in middle age and for most of his books. Seems to have a complex view point although "starship troopers" is certainly a right wing oriented novel.

Thanks for triggering further investigation. Interesting