I think that is excessive physicality based thinking paradigms. Rational but stupid ironically - based on past experience but not recognizing that it isn't applicable. With kinetics defense really is harder and you know who is attacking you more or less - the guys with the guns. Also it assumes a fundamental symmetry that doesn't even hold in conventional warfare.

But it really isn't that way with information on several levels. Bulletproof security is hard but scales better. One patch and everything is immune. Needless to say that hasn't happened with bullets.