With the destructive power of nuclear weapons, it's understandable the concerted effort by many world bodies to vigorously regulate and control the ownership of nuclear weapons. The NPT is one of such efforts.
However, I came across this article and accompanying videos: That Time The Navy Blew Up 500 Tons of TNT Because It Wasn't Allowed to Use a Nuke
It seems that nuclear weapons can easily be simulated by detonating large amounts of demolition-strength explosive. I'm sure even the poorest of countries can afford to put together megaton equivalents of nuclear and tactical nuclear weapons.
So why is there so much emphasis and efforts spent on nuclear non-proliferation focused on nation states to prevent them from obtaining nuclear weapons when alternatives exists? Are our efforts misguided?