Maybe I'm slow , but how is that relevant to the point? Can you expand? Am I understand is that defense is important because sooner or later someone else may choose aggression.
You might put your life savings on the street in front of your house for a day or two without someone stealing it, but sooner or later someone unscrupulous is likely to come along based on the evidence we have
The person I replied to stated that a country refusing to develop military tech for moral reasons was destined to fall to a country that ignores morals and develops that tech. I pointed to an example of an aggressor nation that is refusing to use all the military tech at its disposal. Modern society has decided that ethics don't go completely out the window in war and by and large nation states at least pretend they agree.