Well -- not exactly, but you're also not far off the mark.
You have a preference. You think your preference is the best. The game happens to match your preference. Why would anyone want to change it?
Others have different preferences. The original Fallout 1 and 2 modeled ALL preferences...and in a pretty believable way, too! (Great writers!) It was possible to go through the first 2 games as a psycho maniac mass murdering devil-worshiper. It was also possible to go through the games as a flower picking cuddle faced hippie pacifist. Or...anything in between. But not everything at once. You had to pick a path and stick to it to be effective. The game remembered your actions, and reacted accordingly. (The old Karma system.)
This is one of the things that made the game so popular when it was released. You could literally do almost anything, even though the tech was far more limited back then. If you had a preference, the game had a path for that. The mark of a true, golden RPG.
Personally, I don't play as a pacifist, but I mostly play as a character that tries to avoid violence. If 3 bandits start shooting at me on the road, I'll bury 3 bandits corpses before they learn my name. But if I see a situation that could be mediated, I like to have that option. To put it into my own perspective:
Spoiler I would have definitely played through the bar fight as peacefully as possible. But when they kidnapped Vadim, on my first playthrough at least, I would have kicked in the front door of that brewery...and everyone might have detected a distinct, metallic taste to their beer afterwards.
That's the way I chose to play my characters:
"I'll give you one chance to settle this. I recommend you take it. If not... (He flips the safety on his rifle off.) ...conversation's over. Make a choice."
It would be nice, however, if the game allowed for the full pacifist route as well. (Plus, the no killing thing in Fallout 1 was hard as hell.)