It says in the article that the inexperienced crew was blamed, read it.
It was, however, a known fact that many of the senior officers on board the Vincennes knew very little about computerized warfare. The tactical officer for surface warfare, Lt Cmdr Guillory, knew so little that he routinely used his computer screens as a surface for sticky notes instead. Petty Officer Anderson, who missed Flight 655 on the schedule because it was so dark, also later claimed that he was confused by the gulf's four different time zones, something proper training could have easily helped with. Lt Clay Zocher was the boss of Air Alley, which was responsible for air warfare, but he had only stood watch at that post twice before and had never fully learned and mastered the console routines. In fact, when he was finally given the green light to fire upon the incoming aircraft, he pressed the wrong keys 23 times, until a veteran petty officer leaned over and hit the right ones. Nerves were shattered, and the training seemed nonexistent.
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http://en.wikipedia.org/wiki/Iran_Air_Flight_655#Potential_factors)
Read the rest of the article, that'll answer your question