Comment by lukan
"Creating highly enriched uranium or plutonium are completely different processes."
Not an expert, but isn't all you basically need to do is running the centrifuges a bit longer?
Breeding plutonium is a different process than enriching uranium, sure, but with enough enriched uran you will have a nuclear bomb.
And a dirty bomb is bad enough and simple to construct as well.
You need more centrifuges, several times more, but not orders of magnitude more.
And you need nuclear reactors to make plutonium. The weapons you can make with plutonium are qualitatively different from the ones you can make with uranium.