The perceived need to "launch on warning" is only one of the vulnerabilities and instabilities in the present system, but its elimination would be a start.
Observers can easily be misled by the fact that we have not had a nuclear exchange for about seven decades, but this is false comfort in the case of a system that disallows learning from experience, because one attack would be too many.(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).