Listen to his monologue at the end. He say's he wants to give out water too. I can't remember the exact words. During the confrontation with James he was probably somewhat irked, and thus I don't think he actually offered assistance, but when the US Government seizes something, you give it up, that's just common sense.
More lies. When he charged in guns blazing to the Purifier the first time, he made no offers of assistance whatsoever. He walked in and demanded everything be handed over to him and his jack-booted thugs and when he didn't get instant compliance, he killed another human being to demonstrate he was serious. Their actions elsewhere in the wastes show the only
real interest they had in "distributing" water: using it as bait to draw in everyone unfit to be a member of The Master Race for extermination.
Further, the US government- just like most everything else in the US- is destroyed, Autumn et al's claims of being "the government" have no more validity than would a claim by me that I am the reincarnation of Nerevar. They found some dusty relics of The Old Governement, so they're the government? By that logic the discoverer of King Tutankhamen's tomb had a rightful claim to being the ruler of Egypt.
And no, "just give it up" is not common sense- it's the surefire route to being dominated by self-interested fascists by rolling over and letting them take whatever they want. So of
course "just hand it over" is what suppporters of the Enclave want. It also saves them the embarassment of the
inevitable defeat they suffer (and have suffered repeatedly) when anyone stands up to them.
Even Monty Python knows better than to fall for the Enclave's nonsense: "Supreme executive power derives from a mandate from the masses, not from some farcical aquatic ceremony!"
The Enclave is nothing more than an incurable social disease...it can't be cured, it continues to pop up no matter how often it's forced to fade away, but it never really does anything during its occasional outbreaks besides cause a nuisance. Sort of like herpes.