[Coda]

You bring up Skyrim in particular. The main plot falls into the "enemy is causing ruinous harm to the world, the hero is the only one who can stop it" justification, and it's fairly rare that the Dragonborn is initiating hostilities instead of defending themself from aggressive or mindless foes.

Side plots deviate greatly from this, but since the game is intentionally giving you options to make moral choices, that's intentional.