It seems like Bounty Hunters aren't really interested in hostages.
I've been on my LR char along with two others, and we were pirating at the trade lane for a while. While we've been doing so, we got jumped by somebody named "BHG|Henry.Jonson.". My reaction? I took the trader we were currently pirating hostage, and told him that either he lets us go or I'll blow up the trader along with his cargo hold full of refugees. Well, he did not even react. He did a minimum of RP before he engaged us, and I've tried to get him to talk multiple times, in vain.
Now, I can see why a Hunter couldn't care less about hostages - all they want is money after all (or so I've been told). That's OK...when there's no chance that the Hunter could be accused of being guilty of the hostage's death. If such an event would become public knowledge, it would mean serious damage to the BHG's image, something they'd probably want to avoid, and thus, I think that this incident was an example of really poor RP from the BHG's side.