Now, do my characters do it? Aw... Hell and yea! It's a staple of the sheer existence for my Necromancers to defile the living, let alone the already dead and undead. As for the rest of my characters,? Well... they are on the dark side to start with and will loot everything that is not nailed down.
Although, they are all completely disgusted with a damn dirty thief, in general. I know that is rather ambiguous, but they find a difference in looting crypts and outright thievery. The more I think about it... grave robbing is still robbing, isn't it?
Still, I find it to be anything but honorable for any race, especially a Nord to have no remorse or respect for their ancestors. That is IF there is such a thing as an honorable Nord to start with. ( note the prodding I mentioned earlier )