I've had characters with a whole range of opinions on this. Jenred famously opposed the harsher looting variants, while Malcolm would have calculated how various political factions would react and loot accordingly. Colin was even more opposed than Jenred, Arlian refused to loot at all (or fight other humans, for that matter), and Lyanthan (my current SI character) is concerned with effectiveness. He's probably never going to order KRB because of the raping bit, which he sees as unnecessarily risky and inefficient. It would be better to just kill all who oppose the might of Taselak, if we're not going to convince them to join.
Also, just a note as this has been bothering me, it's not just men in the armies and women that would be raped. The soldiers in the armies are, presumably, mixed men and women who have mixes of tastes.
