In warfare killing your foe with the least amount of risk to oneself is very wise.Ask Gene Fluckley(well you cant he passed away in 2007). I see the submarine as a nasty weapon much like a sniper fighting fair should not even be in a submariners dictionary.Raping would have to invlove an un willing victim any enemny ship does not apply to this notion for they know of the threat of attack and did not properly defend themselves aginst it.Further more rape is a sexual assult or it can mean the act of seizing taking by force abducting or plundering. but those would involve towing away the ships in the harbur not sinking them.