

The point of having nukes is to threaten destruction of an enemy even at the cost of one’s own destruction. Analysts understand that actually using nuclear weapons benefits no one. Nukes don’t benefit the party that launches nukes upon event X taking place, the party that causes event X, or most bystanders. Saying that any party responsible for event X will be nuked is intended to ensure that event X doesn’t occur. Threats are not reality: threatening retaliation is not the same as actually retaliating.
Some facts have been simplified in this reply. Reality is more complicated but these basic principles do seem to hold most of the time.









The link mentions nuclear energy.