Yes, but that depends on the specific breeder design. Besides, if someone really wants nuclear weapons, there are a thousand different paths. Just look at north korea. The wikipedia article on breeder reactors states the reason why there is not more interest in breeder in the first paragraph: >Breeders were at first found attractive because they made more complete use of uranium fuel than light water reactors, but interest declined after the 1960s as more uranium reserves were found,[2] and new methods of uranium enrichment reduced fuel costs.

Breeders could extract 100 times more energy from the same fuel rod than an LWR can, but even at 1% efficiency LWR's are efficient enough that fuel cost is not an issue. That's just how OP the energy density of the fuel is.