without a doubt a horrible event, just saying that there are individual events that transpired in a short period of time that could have led to the tragedy. It isn't just as simple as ATC or Blackhawk pilot or commercial pilot error.
Again another story, back in the day when I was active duty I flew on the AWACS planes out of Tinker AFB in Oklahoma, we were conducting a routine sortie out of an island in the Caribbean at night. Our entire mission was to control the air space and monitor air traffic. Typically we did not report to other control towers because we were supposed to be able to monitor air traffic in and around our general area. One night, were were flying and the navigator was informed of a commercial plane that was at the same altitude but a heading that would have been at our 7 -8 o'clock. The commercial plane would have had no indication that we were out there because we didn't report to anyone because we were conducting a mission. Needless to say, there was nearly a mid air collision. We adjusted out altitude to narrowly escape but it was close enough that you could feel the plane shake. Scariest event in my military career. But the error was because an operator in the back of the plane wasn't doing their job. The commercial plane and the ATC center immediately went to the press to blame the government. The plane is very unique looking so it was easy to distinguish, and the pilot was publicly blamed. But none of it was his error. Anyway, long story to show not everything is as it appears in the first 6 hours of an unfortunate event.