Completely correct on all counts. I was merely trying to put into perspective such actions, not discourage them. The points you bring up also highlight why dwarfs are prone to never commit (and stated as such in rulebooks and fluff books), for fear they might end up with conflicting responsibilities (defend the hold vs keep the promise). That a dwarf will feel guilty or hate himself for breaking an oath is relevant, most humans wouldn't even flinch at lying or oathbreaking, especially if it was convenient for them.

Dwarfs aren't automatons, but they do approach things differently. And it might be said their minds place value differently than a human mind would. None of the fluff should inhibit a player's actions, but they do help to put those actions in context.

A player with a human character that promotes Sigmar's cult, not so exceptional. A human character that's an atheist and is firmly convinced magic and all religious miracles are forms of mass delusion, clearly a stand out in the setting. Likewise, a dwarf that's unreliable and prone to breaking his oaths, would be quite a contrast to the stereotypical dwarf. A High Elf that's utterly convinced his race is a bunch of whiny pansies and in turn admires the resilience of mankind over any Elven trait, clearly another stand-out.

The point isn't that players have to conform to the stereotypes, it's just that there's value to knowing when the players are within what's expected of them as members of a set group of people and when they're outside of those boundaries. At least it helps me when I'm GMíng as it guides how NPC's interact with the players.