new H-bomb project

Truthout.org has a new article up today about how US nuclear scientists are working on designs for a new H-bomb, along with other future nuclear weapons. I really don't understand why we have to go that route...why do we need nuclear weapons? Especially since we don't want anyone else to have them. I think it's really stupid to say to countries like Iran, no you can't have nuclear capabilities, but now we're going to develope new nuclear weapons.

http://www.truthout.org/docs_2006/020706K.shtml