I agree. From a distance and with scant information it looks like a series of failures. One from what I've read of the ATC conversation with the Army Helicopter where after asking if the copter saw the other aircraft it seems that there was no follow-up as to exact location of the AA flight. Also it was reported it was a training flight, my question there is who was piloting the copter. I've also read an eyewitness report from a reporter on his way home who saw the incoming flights along the river and just missed the actual crash that it was very dark at the time so there may have been some limited visibility.
I'll wait on the "official" reports before assessing blame. I will say as a former airborne traffic reporter in Chicago who spent a small amount of time in a Jet Ranger in the 90s, the scariest part of the ride was the times we flew over O'Hare at about 400 ft. I mean directly over the main terminal during morning or afternoon drive. (I spent most of my time in a fixed wing, but occasionally filled in in the copter)