it's pretty funny to see how people are taken in by some cheap propaganda, even in a videogame. just put in some flags, some marching music and there you go

the enclave served as an allegory of right wing political organizations who claim to be preservers of freedom and democracy, while in their true nature being downright fascists.
they were pretty much the perversion of the republican party's view of the world.
but for exactly that reason, it's not to hard for me to understand, why there are some folks here wishing for 'softer' enclave

...which people get served in form of the ncr, by the way.
preserve america', lol. the only thing autumn was willing to preserve was his own ambition for power.
he kills you right off the bat, if you were willing to give him the code to the purifier, just because he deems you as 'useless' afterwards. he seizes the great work of a third person, dedicated to the people, and tries to use it for his own purposes, etc.
you can like the character as much as you want, but, please don't tell us he was a 'good' person. he wasn't AT ALL.
Actually, you're off...
While I do like to see people who understand propaganda... I think you misunderstand what the propaganda IS.
What the Enclave are is -not- anything to do with Republican-party ideals, or even conservatism at heart. What they -are- is an extrapolation of the Nationalist state of the United States of America which was entirely prevalent from the 1950's well into the end of Vietnam, when suddenly being an American became something we were all supposed to be ashamed of.
You see, in the 50's, everything was about America... Freedom... and Democracy. It was about the 'greater good' and 'Ask not what your country can do for you'.
The Enclave is the continuation of that mentality. To them, NOTHING is more important than America the 'symbol'. They don't give a damn about America the PEOPLE... because each man, woman, and child is expendable. The end-all goal of the Enclave is the preservation of their way of life... and the destruction of that thing which threatens them and terrifies them so much that they can't sleep at night: Communism.
It was actually for this very reason that they encouraged nuclear war and social experimentation... because they wanted to be prepared for the future they intended to create. Their plans were to annihilate the strength of Communism, while preserving the best and the brightest, that they might rebuild before their foes had a chance to do so and scourge forever from the world that one thing which could stand defiantly against American Imperialism.
As for Colonel Autumn... well, Autumn was just a man. He was a man with a different vision for the Capital Wasteland, in fact. He wanted to kill you not because you had done anything wrong... but because he knew you had every reason to get in his way. Because he knew that letting you live would mean that you would prevent him from carrying out his plans the way he intended to.
He wasn't the one who intended to wipe out the Capital Wasteland... he wanted the Enclave to -OCCUPY- the Capital Wasteland and keep up the appearances which President Eden had been responsible for by providing the people with clean water and a 'military presence'.
Eden was the maniac... and he represents a group which, logically, after TWO systematic defeats MUST be losing sway with the people.
Nobody is going to accuse Autumn of being a 'Good Guy'... but nor is he President Eden... or even Richardson.
The same rings true for many other men and women you encountered on the Oil Derrick. Many of them expressed tendencies towards feeling guilt and horror at the things they were being 'forced' to do by fear of rampant mutation and factional war. In the end, some of them even helped you escape... and the man responsible for the weapon designed to kill all impure stock on the mainland sacrificed himself to ensure that you and your people could escape.
There were shades of grey presented, even then... but they didn't make any real difference to the player until the end of the game.
The Enclave, if they should return, ought to be a faction which has a presence -throughout- the game... one which you can impact just as you might impact any other faction through the doing of quests and favors and the like.
Otherwise, as I said, they really don't need to be back at all if they're going to be cardboard boogiemen.