Not having meaningful discussions with his captives is his way...not a lack of role play.
As for wanting him dead...well yeah, I can see why everyone wants him dead. But don't suppose that will be very easy. Of course, it's possible, but he has a band of rich, free and well armed companions that seem to be awake quite often. Anyone with weapons or armor coming anywhere near is usually sliced to the brink of death then locked up until they either submit or are killed.
Oasis has nailed his killing style quite effectively, too. Why immediately kill someone, like a newspawn, who may be interested in joining the Clan of Barons if they aren't armed enough to hurt us? Not to mention, that people rich enough to have weapons and armor have already developed their mission in life and it likely doesn't have anything to do with killing everyone in sight and hoarding all their possessions.

