sorry, i didn't want to post a really long thread.... anyways...
I believe that as long as a nation possesses nuclear weapon, the others will for many sees it as a power. The way I see is that if you have a force to destroy or threaten another, then that is a power. I'm pretty sure that is a very common belief.
Another reason to reduce: Terrorism.
there have been cases of smuggling, and Al Qaeda has said to "perform another Hiroshima" to US. They must be secured.
Though there are many other reasons, such as biological and environmental effects, I also believe that the nuclear weapons should be reduced because it is against Einstein's purpose. He hoped for nuclear power to provide electricity to support poor countries.