A conventional explosion is the rapid chemical conversion of an explosive to heat and gas creating a lot of pressure. In an open environment the pressure decreases at the rate of 1/radius^3, very quickly in other words.

A nuclear explosion is the rapid conversion of mass to heat and radiation, Apart from heating and expanding the air around the explosion no other pressure is created. This means a nuclear explosion is confined to a fairly small area, similar in effect to a lightening strike. Except for a direct hit a nuclear explosion is not significant and generally weaker than a conventional bomb.

Our masters know the truth behind nuclear weapons and use the threat of nuclear war to cow everyone into submission. They fear the masses realizing that there is nothing to fear.