Pretty sure the unspoilered bit is a bit spoilery, mate.
I thought that part had been revealed a few times in the thread already, but eh. I'm bad at gauging spoilers.
I didn't open the spoiler tags yet either, since I'm definitely not far enough in. But frankly, as much as I'm enjoying this game, it can't really convince me that the Brotherhood was always evil. I'd need evidence from 1 or 2.
I'm ready for the Brotherhood to finally be monstrous in FO4... I think it'd make a nice change. But it'd just be a rogue offshoot, like the Outcasts in FO3. Or... arguably the result of a gradual corruption. That'd be understandable and interesting too, if a bit painful. Just like the NCR-BoS war.
But like, some guy in the Fallout story subreddit was arguing that the BoS slaughtered civilians right after leaving Mariposa... Based on an account which praised Maxsom to an uncomfortable extent and mentioned raiders in the wastes. Arguing that the raiders were probably just civilians. ...So yeah, that's a strawman, but it seems like this fan hate comes from an in-game source I just haven't found. And I want to know where to look.
Reminds me of how I loved Durandal in Marathon 2, literally cried for him at one point, but eventually I played Marathon 1. He did some terrible things before he started helping humanity.