This is actually a great plot for a supervillain in a movie. Simultaneously detonate all nuclear weapons on Earth, albeit at 3% of it's power. That would seriously fuck us up.
Most nukes are underground, so most of the fallout would be contained. And the result would be a world not fearing anymore for accidental or intentionally nuclear anhilation.
So most would consider that supervillain a super hero.
The actors who are genuinely irrational don't really have the number of nukes to do more than cause ~megadeath. This sort of thing would only happen once and then the actors would cease to exist.