The Russians had no intention of starting a nuclear Armageddon any more than we did throughout the Cold War. They were evil communist tyrants, but at heart reasonable people who knew Russia would cease to exist as we would in any such general exchange of nukes.
These terror-sponsoring despots, religious zealots, and nihilistic looney-tunes we now face have no such compunction about releasing the nuclear, (or bacteriological/chemical), genie from the bottle.
Times changed a little after 10:30 AM on September 11, 2001. Its high time we recognize that fact. The savages are still at war with us. In the words of Air Vice-Marshall Keith Park in September of 1940 during the first heavy Luftwaffe attack, “This is only the beginning, they won’t stop now.”