Where's the option that says, "Hey, I know these people. Hey, Father, I just got back a- you what now? I'm sorry, you want me to kill the leader of the Railroad?! Just like that?! Look maybe if we- Um. cause weapon development is probably a bad start to peace. what's that? We're having a meeting? What about? Oh, you want to go to war with the BoS? Just like that?! Ok, well maybe I can- oh, nope, no dialogue option that says, "What the hell is the matter with you idiots?" Um. It doesn't look like the announcement triggered anything. I changed the words to Father's "Institute Announcement" to be a message of peace and comfort.I started the Institute's reactor, being sure to note that it was a resource for EVERYBODY.I talked a scientist into going to the Institute without firing a single bullet at a Minuteman.I reclaimed a group of synths by letting the BoS, Institute, and Railroad shoot at each other like idiots.And hey, lucky me, there are some clues that I'm actually gonna pull this off: As I worked my way through Father's quests, I was careful to pick responses and take actions that avoided as much conflict as possible.
OK, no problem, I'll just have to walk on eggshells and be super careful about how I tackle each mission. Unfortunately, the Institute and the Railroad are diametrically opposed. I should also get around to everybody topside and tell them the truth." Upon returning to Sanctuary, my guy even told another character, "Remember, the Institute isn't our enemy." Awesome, I'm gonna bring peace to the Wasteland. I won't bother going into the minutiae of their whole deal, but I took one look around and said, "Well this is obviously the best hope for a future for the human race. Then the twist comes, and you learn all about the Institute.
This wasn't particularly difficult, of course, as they don't really seem opposed to each other (at least until towards the end). Instead, I found myself mostly balancing between the Minutemen and the Railroad. The only group I didn't care about was the Brotherhood, because the Brotherhood are dicks and always turn out to be the bad guys. Throughout the course of my 30 hours with Fallout 4 I took careful steps to ensure I always had an "out" or peaceful solution to any problem involving the multiple factions in the world. Take this! It's a key to unlock the credits! No warning, no dialogue box saying, "Yo, this is gonna mess up EVERYTHING," nothing. Then the writers decided that peace in a game about war is apparently impossible, and the game somehow funneled me into a quest holding a bomb that would undo everything that I had been working so hard to accomplish.