* Much like many things society progresses, generally in the western world that progression has tended towards greater liberty (in most respects) of its citizens e.g. Tom Holland (a documentary film maker in the UK) argues the separation of church and state can be traced back to the Bible and it been a steady progression to secularism from there (whether that is valid or not I have no idea).
* You cannot judge people of the past by the standards of today. Someone that would have been seen as progressive back then would be seen as some sort of ultra-traditionalist far-right fridge thinker. You have to judge them by the standards of the time. I am sure in 200-300 years people will see us as backwards, poorly educated and barbaric.
I don't know the history of the events or the characters that led to American indepedence (I am not an American) but what I do find when people feel the need to character assasinate important figures of the past is that they do massively over simplify events and the people involved.