This is a red herring argument.
What the rest of the world decides to do with reprocessing technology (ie. making bombs) should not dictate what we do with reprocessing. The Plutonium we would make from reprocessing would go right back into nuclear fuel.
You hit it on the head when you stated that rogue states ESTABLISHED weapons programs using reprocessing. They didn't steal the plutonium. They used a good technology for less than desirable outcomes. You also mentioned the concern about nuclear material being diverted from power programs to weapons programs. This is also a non issue in the US. We already have a surpluss of weapons material and absolutely no need to get more as we are currently getting rid of those stores. And we are certainly not giving it away to anyone.
So tell me, forgetting about what other countries decide to do with reprocessing technology, why shouldn't the US reprocess?