If an oil plant blows up, yes, it will be horrible and many lives lost. However, it won't cause climatic changes, exclusion zones, horrible birth defects, massive natural resource contamination and losses with the potential for a regional and perhaps global catastrophe. Nuclear waste has to be babysat for, well---eternity.
We've only had two major catastrophes (that were still considered contained or controlled), yet one brought down the Soviet Union and the other disaster's total effects remains to be seen...as we type, contaminates pour into the ocean from Fukushima with no end in sight. The toll on regional wildlife and environment, way of life for locals, is staggering; there will global impacts to health because of this disaster.