>>536791547
i loaded an autosave and waited until a couple of them were in the same room, which i had a lifter robot inside.
then i built a wall, trapping them inside. and then the lifter wall broke down the outer wall, creating vacuum and killing them (without negative consequences).
and so i didn't "kidnap" as many friendlies when i went back down to the planet and I didn't lose Allied status with Fallen Empire