Those who follow this view fail to incorporate is the human element.
States act unreasonably because humans are sometimes unreasonable. One may do something knowingly adverse to themselves because they want to. Now is there any logic in this? Nope. So giving states access to the most powerful weapons known to man is logical? Not even. Middle Eastern states have shown that they are prone to make illogical decisions. Also, there is much conflict in the region, so how would it be a good things to have each state blast the other up at any moment? There is already too much tension in the region.
In addition, states with low stability or experience internal conflicts pose the threat of having non-state actors use these weapons for their own goals. Since non-state actors do not have defined borders, it would be impossible to retaliate without destroying another country. Internal conflicts in states could turn global if one side possess a nuclear weapon.
Moreover, many nuclear bombs going off would be an environmental disater. If one thinks the bombs dropped on Japan caused radiation damage, nuclear warheads toady are much, much, much stronger. Many people would die, environments would be destroyed, and Earth as we know it may become uninhabitable. To those that think proliferation is a good thing (not that I think anyone in class does), is that the type of future you would want?
Though the spread of nuclear weapons may be somewhat inevitable (unless states completely destroy the ways and technologies to build them) it is imperative that nuclear weapons must be safeguarded. For the Middle East, the lack of nuclear weapons preserves regional power, and also serves as a balance of power between the different states. I really don't want a future with this in it:
