... but its not? Literally, the "harder" part about making a bomb with reactor-grade material is keeping it from blowing-up prematurely, while still getting maximum yeild at boom-boom time.

A less-advanced nation might get a lesser explosion out of a "safer"(doesn't explode until its supposed to) bomb with reactor-grade material, but its still going to be a massive, nuclear explosion, and the unspent fuel creates additional radio-active fallout.

Apparently, civilized-countries' worst nightmare regarding weapons-grade plutonium is that those that "shouldn't" have "the bomb" could build them and then be able to shelve them for a later, legitimate threat. Oh, and not being able to cry "they built a dirty bomb!!" if such were ever used.