I think by developing our defense technology we are indirectly creating a cold war situation where in whole of the world is getting involved in the weapon race. Strengthening defense is just acting as a camouflage for nations trying to stand first in this weapon/death race. And as said and supposed every action has a equal and opposite reaction. All these new technologies being worked upon can back fire any time resulting in a mass destruction or even to the maximum of eradication of human kind from the face of the earth.
Embedding intelligence in defense tech is a good thing because it will make our defense weapons better and more effective. We need our weapons for defense to be more intelligent so when certain countries are shooting missiles at us we can shoot them down. If our weapons aren't intelligent odds are when they are shot at enemy missiles they will miss and the missile will reach its target.
If you want to say that new intelligent defense weapons are going to cause cold wars and other things you are wrong. In all of the years we have had our new defense weapons no wars have been caused. In fact we should have defense tech how are we supposed to know if we are about to be nuked. How are we supposed to know if were about to be attacked without it. Also sometimes the best defense is the best offense. We need our defensive tech for defensive purposes and offensive purposes. What happens if their is a third world war. Then will defensive tech be bad?