I was born is 1950, so I guess I’m qualified to comment.
The 60s were a lot different from what we’re seeing today. There were several significant factors at play then.
First, my parents’ generation still felt both righteous and invincible; WWII hadn’t worn off. This also rubbed off on the children. We watched lots of war movies as kids, and they all glorified the war.
Second, there was the Soviet threat, which was considerably more menacing than anything that faces us now (not to say that what we face now isn’t dangerous). And along with that was the paranoia about the communist threat within, which was still very much alive even a decade after McCarthy.
Third, there was internal instability and uncertainty, which started with the civil rights movement, and continued through the Vietnam War.
Fourth, beginning in the mid-sixties, there was the generation gap. This was a big deal, and very complex. My own opinion is that it was mainly caused by the difference between our parents and the war they fought in (BTW, nobody ever talked about Korea), and our generation and the war we were in. But there were other factors as well. [Disclaimer: I did not go to Vietnam].
What you ended up with was a population that had considerable uncertainty about what was going on both domestically and abroad, and so there was room for a lot of movement politically. The political assassinations, the war, the Kent State killings, and other events stirred the pot up quite a bit.
Today, I don’t see the same thing. What I’m seeing, and I agree with you, is quite entrenched positions, with both sides absolutely convinced they’re right. I fall into that. I think everything Dubya has done since he took office is wrong, and that he has to go. No debate. No compromise. He’s taking us in a direction I don’t want to see this country going. His backers feel the same about their opponents. So there isn’t that much political play in the country right now.
Also, the big bad now is terrorism, which is considerably more nebulous than a conventional enemy (we thought the Vietnam war was fuzzy, but it looks positively concrete by comparison). To the extent that this is being addressed, it’s mostly being done in secret, with diversions like Iraq to keep everyone from trying to peer into dark corners. I’m personally waiting for the next Daniel Ellsberg.
This rambling-assed post is not really answering the question, I guess. My own feeling is that we’re in a phase somewhat like the earlier part of the Vietnam War, before Tet. Positions have been taken, everyone’s in their trenches, and we’re waiting for something to shake things up.