You should read the wiki page on the actual NCR-BoS War, that's where I got it all from. Go to Elder Lyon's wiki page, it will show you the quote of him talking about the BoS having a hard time in the West. It also says it on the NCR-BoS war page, FYI. If you're unwilling to take into consideration actual points, it shows your position is weak, and you have nothing to stand on. You are the one who's wrong, and completely ignoring what is logical and illogical for a faction like the WCBoS who's in a war, has limited recruiting capabilities, and short supplies. You're ignoring actual valid points backed by lore and reason, and trying to bring up others that don't even have anything to do with what we're talking about (the Legion,) making comments that are pure speculation.
You're free to disagree with everything I've said, but you're not putting anything up against it, that wasn't weak and illogical lore, set by Bethesda to shoehorn the BoS into Fallout 3, making them a "staple" of Fallout. Which, again, my original point was that the BoS doesn't need to be in every Fallout game, for the game to be a Fallout one. But your post looks like another attempt at deflection, trying to say you're again wasting your time, when you've spent so much trying to debate on weak ground, about a weak story.
And why would Super Mutants across the country, posing this threat to people on the East Coast, be of any concern to the WCBoS Elders who are apathetic and uncaring for anyone outside their bunkers, and at the time, likely in a heated war with a much larger threat? If it doesn't threaten the BoS immediately, the Elders don't care, that's been shown plenty of times, in lore and in-game. Them sending those who eventually make up the MWBoS, after the remnants of the Master's Army, who obviously know about the WCBoS, and likely want revenge on them, that makes some sense. But sending their own contingent of capable fighting men/women, across the country to fight Super Mutants that pose no threat, don't know about the WCBoS, could possibly be heard about and stopped by the MWBoS, makes no sense. And as I said, it was just a cheap way for Beth to shoehorn the BoS into Fallout 3.