If you were to attack an alien race, you probably shouldn’t even use weapons. Just use shields they can’t get through and then you might as well just stab them a couple times with simple knifes/spears to make sure they won’t get access to weaponry they can use to fight back. (and if they do manage to beat you, just nuke the alien scum from orbit)
But, I think it should be a possibility, just have the users be able to toggle them on or off (same as with other game-ending disasters)