I have been told by one who studies war that the bulk of the German weapons which made blitzkrieg effective were either taken from Czech armories or developed from those same weapons.

On the original thread, while "constructive" and "destructive" are generally useful labels, there are many activities which fall into one category on a societal level and another on an individual level. Similarly, the long-term effects of any action may differ greatly from the short-term. This makes it much trickier to analyze the "rightness" of any action, even if we could agree on the extent of the area in which "constructive" and "destructive" should be measured.