I've always found it funny how amazingly inept the Brotherhood chapter in the west are. They seem to genuinely have no clue about survival; The NCR, stretched thin as it may be, is still the strongest thing the west coast has and everyone should have known it after they completely raped the Enclave at the Poseidon Oil rig. The Brotherhood, however, apparently didn't get the memo that the NCR doesn't fuck around and made a futile attempt at holding a power station the NCR clearly wanted for Vegas. I know the Brotherhood thinks they're awesome because of their power suits but news flash, the NCR has even more power armor including what they jacked from the Enclave (who actually had better power armor because the Enclave was still developing new technology while the Brotherhood are simply scavengers)