..these are all safety measures which relies on everybody trying to play it nice, which _wasn't_ the case on 9/11'th.
They hit stationary buildings. It is hard for one aircraft to hit another on purpose, unless it is considerably faster than the other one, in which case radar will be of limited help for the target in any case.
..FWIW, that spectacular russian airliner and Lufthansa(?) freight plane mid air over Germany a year or so back, and several near misses in Norway the last few years, were all under (busy!) ATC
controlled IFR. Carry your own radar, and you see them coming, and you can dodge them and you can tell ATC "Bring'em on." ;-)
RADAR wasn't necessary -- TCAS works fine as long as everyone has a transponder (which they have to in the flight levels). Initially, TCAS was optional, then it became required for passenger planes, and in the U.S., at least, it is now required for cargo planes because of an incident in the late 1990s. In the case of the accident you mention, I'm pretty sure that one of the airliners did get a TCAS alert but responded incorrectly; in that case, it's hard to assume that they would have done any better with primary radar (which is much harder to interpret, even for ATC).
All the best,
David
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