As to the original question... there are plane crashes and then there are plane crashes. Having been in the aviation industry for many years, a little research will show that certain airlines/aircraft combinations are more prone to accidents. This
Iranian crash was actually Caspian Airways, operating a Russian built Tupolev TU-154M. (seen here:
http://www.airliners.net/aircraft-data/stats.m ain?id=376) that airline has a nearly death-wish accident rate. Although Iran would like to blame the imposed embargo for lack of parts, the true causes are linked to bad maintenance, old aircraft and poor training. There are few flights per week and the rate of accidents (nearly always fatal) is extremely high, so much so that the world body that helps determine aviation safety (ICAO) by country, has deemed Iran (among others) unacceptable for its members airline operations within Iran...