The issue isn't really with nationalism by itself, but when nationalism is associated with others problems; it's more like a cathallizer than a cause.
Pakistan dismisses concerns about its nuclear weapons, calls them 'the safest'
http://www.theglobeandmail.com/news/...rticle1819975/
I'm not really convinced by Pakistan's claim but I guess than nobody would say than their nukes might end-up on others hands.