Controversial as the wars of the last decade or so have been, they didn't divide the American nation as much as Vietnam did.
I think it's just as bad. There is a HUGE amount of controversy over the wars in Iraq and Afghanistan and that is never, ever going to stop. And of course the troops are just caught in the middle.
As for the original film, I found something interesting: the small town sheriff is a veteran of the Korean War - he is just as decorated, if not more so, than Rambo was. And that's another source of conflict - the sheriff is kind of jealous that everyone has forgotten Korea but Nam is still fresh in their minds.