Put simply, the problem with neoconservatism is that it is still with us. The neoconservatives' foreign policy ideas should have been sealed in a very deep grave by now, but they continue to roam the earth like zombies in a bad horror movie.
In today's Guardian, Francis Fukuyama notes that, in spite of the utter failure of the neoconservative plan for Iraq, there are many neocons making the same arguments for an invasion of Iran that were made for an invasion of Iraq five years ago. It is bad enough that so many ostensibly intelligent people have been completely immune to any kind of critical thinking, but even worse is the fact that some still have influence in the Bush administration.
Perhaps, to change the horror movie analogy, we need an exorcism.