Greetings!
Excellent posts S'mon and Tsyr! I agree with you both fully. Here in the United States, "Kidnapping" is a special circumstance worthy of death. The fact that a kidnapped person dies while in custody of the kidnappers--regardless of how, or what their intent was--is reason enough for a charge of murder to be applied.
Thus, in addition to the rules of the game, kidnapping, and now, murder, plus extortion and robbery are all vile, evil acts that the group deserves to swing for. They deserve to be caught by the King's Rangers and strung up good! They should die, for they are evil wolfs'heads. They should be ashamed of themselves. Indeed, they should prostrate themselves before the righteous magistrates and recieve the righteous judgment that is reserved for them. Just as in real life, these people are vicious criminals, and if you don't abstract what they did as to some no-name "fictional" character, and apply it to "real" people within the story, they would be hated and reviled wherever they went, and hunted relentlessly for their crimes against society, and the King's righteous Law. They are common, vicious criminals.
Sad to see, but it is a bad start for a campaign. They should roll up new characters, and before they shoot their mouth's off and do something so wicked, selfish, evil, and yes, stupid--they should really sit down and do some thinking and reflection on what motivates their characters, what kinds of values they have, and think about the consequences to any action they take, before they do so.
It is interesting to note that some research has shown that criminals strangely have this common belief that consequences don't or shouldn't apply to *them*. That, I think, is a key ingredient psychologically, to people being evil, and others who aren't evil. Evil people think they can do whatever they want, whenever they want, to whomever they want, and don't think they should suffer any consequences for such behaviour. Consequence-free behaviour. Good people recognize that there are consequences to their actions, and when their own actions hurt or deprive others of life, security, happiness, etc, then they are going to be forced to pay the price for their actions. That price, depending on one's actions, can be steep indeed.
Your players should really think about these issues when they make up new characters, because these characters are evil, and they deserve to die.
Good luck!
Semper Fidelis,
SHARK