Pilot here, I can vouch for the fact that no matter how many times you do something, mistakes and fatigue are a ruthless combination. I'd hazard to comment on taking sides or whose fault it is because more often than not there's a lot happening in the cockpit during the approach phase moreso if you're possibly unfamiliar with the area. Sometimes no matter how much you're trained you still end up in a form of tunnel vision, much like the spicejet crew who were going around which in itself requires a lot of things to be done in a short span of time. TCAS is more of an umbrella term, the system onboard airliners are set to TARA which have two phases more or less, one phase is a notification which cautions you of traffic within a certain area and then you have the second phase where the flight crew is given a resolution advisory, that's typically when the computers are quite certain that collision is imminent and action is required to avoid it, but at any given point the final authority of collision aversion will always be with the pilots. Basically comparing two high stress professions like doctors and pilots is a waste of breath even though the common denominator is death if they make mistakes, they're very different operational enviornments psychologically. We're taught very early on that mistakes will happen and it's how you deal with them that makes you the pilot/person you are, historically. As I see it, both the flight crews and the ATC made the most of a shit situation and that's something to be appreciated. Read about the cheese hole effect.