The brotherhood were an
optional faction in the first two games, and were complete JERKS. They only cared for technology. The problem with Fallout 3 is they made the Brotherhood the knights in shining armor and made them "rogue" in the sense that they were caring. The outcasts were the closest to the old brotherhood. But this game captured them quite well. Cross them, you die. Its technology and following the codex. Thats what its all about. No helping wastelanders, none of that.
You see, the NCR had a technological war with them and wiped out a lot of the Brotherhood in the Mojave chapter of the Brotherhood, so their power and numbers decreased. Seeing as how the brotherhood follows the codex to the exact last word, they of course wouldn't listen to reason, but would rather decline. Its a rather fitting death for them, though I love the brotherhood a lot.
And to be honest, I prefer this Brotherhood over Fallout 3's. No offense of course.
Re-editing this for the fifteenth time, lol. Lyons disobeyed orders in that he went and took the DC Chapter and abandoned some of the rules of the codex and Brotherhood and began to help wastelanders, and so the Brotherhood in mostly everywhere severed ties with them.
The brotherhood, also, isn't really that important. They are a staple in their power armor, sure, but they are minor in that they aren't a required faction to ally with, just helpful...except in Fallout 3, which unfortunately are required to side with (and work with) for quite a while in the game. All-in-all, I have no pity for their decline, its like a Greek Tragedy: they have 1 weakness (following the codex and rules), and even with all of their strengths this weakness will be
come their downfall.
Thats why I LOVED the Enclave remnants. Excellent work there. The Enclave in DC...absolutely not, I wish that never happened, but what can you do.