Have you read about Chorda's special ability, for instance? 'Acceptable Losses' ? Or her M.O. in general?
Most of the successful Rogue Traders in the expanse are ruthless madmen, separated from pirate kings and marauding warlords only by a Warrant of Trade. They use and in some cases abuse people, placating only the key personnel they need to keep control.
A missionary barbequeing hostages with the kidnappers is more than fitting - even RL governments have that "do not negotiate" rule; its not farfetched to assume that the Imperium or a Rogue Trader is not even going to make the attempt of a farce, unless the hostages are important. Same goes for most examples listed here, especially the ones involving Xenos.