Even believing that’s true - how can you be sure they wouldn’t aid al-Qaeda in their war against America? That is the other risk of these America-hating nations acquiring WMD. They may not be willing to strike the U.S.; they may be willing to give al-Qaeda the weapons, and let them do it.
I don’t think they would try such a thing. Rather they will use the rhetoric to keep their populations fearful of external threats and under control, but it is not in their interests to actually act on it.