There isn't any evidence.The evidence has for many years heavily indicated that they are in fact desirous of such a capability and moreover that they have been taking steps to pursue it.
20% U-235 is hardly weapons-grade. It's considered the absolute bare minimum of weapons-usable, on the upper end of LEU. It's being used in their research reactor and, in fact, was being supplied by Argentina since 1994. Interestingly, the US were the ones who provided the reactor to Iran and even supplied them with HEU to operate it between 1987 and 1994!If nothing else the open fact that Iran continues to enrich its uranium to 20% U-235
In 2009 the US proposed that Iran send some LEU to Russia for enrichment to 20% which would be sent to France for manufacture. It was Tehran who rejected this proposal on the grounds of delivery concerns.
So it's comical that you are complaining about this.
There are plenty of reasons to enrich uranium up to and past 20% besides producing weapons (naval reactors, neutron reactors, producing medical isotopes, etc.). You have absolutely no idea what you're talking about.There is no reason to do this unless you are on a weapons trajectory.
"Some" people "worry[ing]" isn't proof of anything.It is not disputed that Iran is stockpiling U-235, as well as creating other facilities and fortified reactors where some have begun to worry that enrichment in small amounts has reached higher levels for test purposes.
Why don't you cite your source?The IAEA also issued a report claiming that Iran had returned, or probably more accurately had been rediscovered, to be researching warhead design and implosion triggers.
You are absolutely insane if you think attacking Iran is a good idea.Give a cap of 25% or 35% and say that once sustained enrichment at these levels is detected or discovered, an attack will occur.