Yes they ditch the codex out of smarts as much as goodwill and still the bos had a civil war and split up into the lyon's bos and outcast.And they defend three dog because he is one of the few people on the radio trying to stop the so called brain washing of the enclave the bos's nemisis in fo3 .
I still view killing ghouls as morally incorrect and again you can backstab the bos atleast once if not twice .
And you got that info about them trying to stop Enclave propaganda where? The Brotherhood don't even seem to mention the Enclave at all until they take over project purity.
The Brotherhood would have dropped everything at the smallest hint of the Enclave in DC. You know because the Enclave are there nemesis from Fallout 2. That and the Enclave have all kinds of goodies. The Brotherhood remained clueless about the Enclave despite the Eyebots flying around. And if they did know about the Enclave since day one of making it to DC. Then Lyons is massively incompetent, for ignoring the Enclave threat for so long and not telling the orginals about it. The Outcast wouldn't have split off from the Lyons if the BoS put their effort into hunting down the Enclave right away.
So the BoS in Fallout 3 aren't white knights because they kill ghouls? Killing a ghoul in the wasteland is like killing a radroach to most people in the wasteland. So in human terms, the Brotherhood in Fallout 3 are white knights. If they kill a ghoul now and then so what. The Enclave want to kill everyone not Enclave.
Again backstabing the Brotherhood is not the same as joining the Enclave. Even if you destroy the Enclave in Broken Steel, it doesn't really hurt the Brotherhood. They still win, cause the Enclave also get destroyed. Helping the Enclave by putting the FEV doesn't do a damn thing. So the Enclave's plan was crap. And you still have to svck up to the BoS to start Broken Steel.