As I said before, my advice is, take your hostages, and go close to a planet or the sun, some part of the loot always go to the atmosphere and they're destroyed. That's the only thing I can recomend to try to avoid those guy ruining RP with the "all hostages are safe".
I proude to say, I didn't save all the hostages the last time, I have saved %15 I guess... the navy failed that time, but the players had a lot of fun.