On January 7, US president Donald Trump promised to withdraw the US from 35 international organizations and 31 UN agencies:
The Memorandum orders all Executive Departments and Agencies to cease participating in and funding 35 non-United Nations (UN) organizations and 31 UN entities that operate contrary to U.S. national interests, security, economic prosperity, or sovereignty.
Unverified: then the White House deleted the announcement from their website (personal note: I did receive 404 on it for a while).
Correction: announcement is still up or has reappeared. An archived copy is also available in case they change their mind.
Your implication is that NATO being gone is a shrug.
My argument is that it is not so simple. Getting the components of NATO back (particularly the coordination of the common defense.) would take time, time that would create a vulnerability other powers will exploit.
And yet here you are arguing for escalation and use of nukes. The only reason MAD has worked is no one has yet call one’s bluff (or rather has with Russia constantly reminding they have an arsenal and totally will use it, and yet here we are.)