^ The Sheliak probably destroyed the colony anyway (even when the colonists evacuated), so I doubt Gosheven bothered with that.
As for the Alamo: I repeat, there was symbolic value in one group of humans staying to fight another group of humans. The Alamo was much more of a fair fight than this ever could be. Gosheven's colonists attempting to stand up to the Sheliak would be like trying to shoot down a jet airliner, barrelling down the runway where you know it will run you over and crush you, with a BB gun. Or, more to the point, trying to blow up a bomb that is about to land on your house and destroy you, using nothing but a set of firecrackers.
In any case, the result is the same: What possible value could there be in a slaughter that has literally, absolutely no chance of ever going your way? It's not symbolic, just silly.