Credit or debit cards for starters are nothing short of shoppers' Novocain. Even in the age of digital purchases and virtual money we still attach a special value to dirty paper with pictures of presidents on it. Handing some of that to a cashier simply hurts more than handing over a little sliver of plastic.
Science has produced such powerful weapons that in a war between great powers there would be neither victor nor vanquished. Both would be overwhelmed in destruction.