Why is it so hard for fallout fans to abstract their thinking?

This is just something that’s always bothered me about fans of this franchise is they can’t separate what they know to what people in universe know. Discussions on fallout 4 and its factions are especially annoying as most factions don’t have a full picture of the happenings of the world. Same thing with synths we know that they are sentient and pretty much people but to the average person who people like the BoS and minutemen get their information from synths are monsters, that replace loved ones and friends. It’s not that hard I just wish we could actually see some growth in this community