Nukes do not help against guerilla warfare: their destructive power is so big that they are really unreasonable attack weapon, and only a deterring factor instead.

They protect against being "policed" by big world countries.

Eg. if Ukraine still had nuclear weapons, Russia would not have been invading them (or are they "protecting" them, as promised when they took their nuclear arsenal for destruction?). If Iran or Iraq had nuclear weapons, they would not have been bombed by US.