POTENTIAL CONFLICT IN A NIGHT OP BTWN CLBING OPPOSITE DIRECTION TFC.

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FLT X (US) AT 7000 FT PROCEEDING FROM E DIRECT TO MCI. WITH RADIO/RADAR CONTACT WITH MCI APCH CTL. MITSUBASHI CALLED IN AT 4000 FT; RPTED VISUAL CONTACT WITH US AND CLRED TO CLB TO 15000 FT REF VISUAL WITH US BY APCH CTL. APCH CALLED TFC TO US; NO CONTACT; THEN CALLED AGAIN (SUSPECT THAT APCH WAS TRYING TO LET US DOWN FROM 7000 FT AND COULDN'T UNTIL WE HAD VISUAL ON THE MU2). WE INDICATED WE THOUGHT WE HAD THE TFC. NO TA; THEN RA COMMANDING DSCNT IN EXCESS OF 4000 FPM DOWN. TCASII INDICATED TFC APPROX 3/4 MI AND CLBING THROUGH 5800 FT MSL AT 11:30 O'CLOCK POS AND CLOSING. SPLIT DECISION TIME: I ELECTED TO IGNORE TCASII VSI RA COMMAND AND EXECUTED A PULL-UP AND BREAK R AS TFC CONTINUED TO CLB THROUGH 6200 FT AND CLOSING. WE LEVELED AT 7900 FT; ADVISED APCH AND THEN CONTINUED TO NORMAL VISUAL APCH AND LNDG AT MCI. PROB AROSE BECAUSE: MU-2 MADE CARELESS AND RECKLESS VISUAL CLB. MOST LIKELY IMPATIENT THUS NOT MAINTAINING COURSE REASONABLY CLR OF TFC. CTLR OVERLOAD PROBABLY PREVENTED US FROM RECEIVING VECTOR CLR OF CLBING TFC (LAST CLRNC WAS DIRECT MCI AT 7000 FT). VISUAL SEPARATION AT NIGHT LOOKING AT LNDG LIGHTS IS DECEPTIVE UNTIL TOO CLOSE! TCASII SYS LIMITATIONS (HAD WE FOLLOWED RA THERE IS NO DOUBT IN MY MIND THAT IT WOULD HAVE CAUSED A CATASTROPHE!). HUMAN PERFORMANCE CONSIDERATIONS: TCASII AT OUR AIRLINES; WE HAVE NO PROVISION FOR SIMULATOR TRAINING OF RA MANEUVERS. ANYONE ASSOCIATED WITH TRAINING AND THE HISTORY OF ACCIDENTS KNOWS THAT INST FLYING IS BASED ON TRUST OF INSTS AND PRACTICE TO THE LEVEL OF 'CONDITIONED RESPONSE.' TCASII PROCS CAN BE TALKED ABOUT UNTIL YOU ARE 'BLUE IN THE FACE;' BUT RESPONSE ACTION AND TIME WILL ALWAYS BE FAULTY AND SLOW AT BEST! UNTIL THE SYS IS FLAWLESS AND WE CAN 'PRACTICE WHAT IS PREACHED;' THEN THOSE FAMOUS LAST WORDS 'WHY IS THAT DAMNED THING GOING OFF!?!' WILL BE ON TAPE AGAIN. THE ATC SYS BROKE DOWN (AS IT WILL DUE TO HUMAN FACTORS FROM TIME TO TIME) AND THE TCASII BACKUP SYS DIDN'T WORK AS ADVERTISED. WE WERE LUCKY; THIS TIME.