Ok, so the raider eventually get into your vault no matter how updraded your vault door is. But how can they drain my resources if I kill them? Fine, if I let them get away it is a logical conclusion that they manage to run away with some of my food and water - but power? Are they stealing batteries?? And no matter if you kill them or not they will drain your food and water. Are they eating and drinking during the attack??
Come on Bethesda, you are better than this!