Tsar Bomba

Why does Ahmadinejad try to get nuclear weapons so hastily? I can't say the fact without hesitation. "Hydrogen bomb is by far more destructive than Uranium bomb." As a matter of fact, Hydrogen bomb "Tsar Bomba" Which was made by USSR in 1961, had three thousands times as powerful as usual nuclear bomb. More over, modern aerosol bomb is known to have the destructive power that is even with the atomic bomb of Hiroshima type.
  Once the ability of product is got, an atomic bomb is by far cheaper than usual weapons.
Probably,this is why Iran and North Korea try to get nuclear weapons. And they will start a business with them.　I can't understand any reason but this economical reason.
  We all already know the fact that only one mad dictator can make the world  a ruin.
Even now ,I'm astounded  by the fact that 50-year old Tsar Bomber had already had such the demoniac power.