Deaf and blind.
There is nothing controlled nor useful about an H-Bomb. It is UNcontrolled. It’s the difference between 13th century Chinese gunpowder bombs and 21st century Internal Combustion Engines. 700 years difference, control vs. uncontrolled. But someone as ignorant as you is calling an Hbomb “useful” amounts of energy produced. Go ahead and stand next to one and let it go off to prove to us how useful it is to you.