AN ARRIVING DC9 IS ISSUED A DEPARTING COMMUTER ACFT AS TFC AND HAS ACFT IN SIGHT. CTLR CLRS COMMUTER ACFT TO HIGHER ALT AND TO MAINTAIN VISUAL SEPARATION FROM THE DC9. THE DC9 PLT GETS A TCASII RA ON THE COMMUTER ACFT AND MANEUVERS TO REMAIN CLR OF THE COMMUTER.

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THE DC9 WAS 10 MI E OF ARPT; WBOUND DSNDING TO 7000 FT. THE BE02 DEPARTED ARPT AND WAS TURNED EBOUND AND GIVEN INTERIM ALT OF 6000 FT FOR SEPARATION WITH THE INBOUND DC9. WX WAS VMC. TFC BTWN THE DC9 AND BE02; OPPOSITE DIRECTION; WAS EXCHANGED. THE BE02 RPTED THE DC9 'IN SIGHT.' THE DC9 WAS TOLD THAT THE BE02 HAD HIM IN SIGHT AND WOULD MAINTAIN VISUAL SEPARATION AND CLB. THE DC9 RESPONDED 'ROGER; NOW WE'VE GOT HIM IN SIGHT TOO.' THE BE02 WAS THEN INSTRUCTED TO MAINTAIN VISUAL SEPARATION WITH THE DC9 AND CLB TO 15000 FT. AS THE BE02 STARTED TO CLB; THE DC9 SAID 'WE'VE GOT A TCASII RA; WE'RE TURNING L AND DSNDING.' EVEN THOUGH THE DC9 HAD THE TFC IN SIGHT; HE STILL TOOK EVASIVE ACTION BY TURNING AND DSNDING. THIS ACTION TOOK THE DC9 DIRECTLY INTO THE CLB CORRIDOR OF THE PRIMARY DEP RWY. I TOLD THE TWR WHAT WAS HAPPENING AND FORTUNATELY THERE WAS NO TFC ROLLING FOR DEP. IT SEEMS TO ME TO BE RIDICULOUS; NOT TO MENTION DANGEROUS; FOR A PLT TO BE MANDATED TO RESPOND TO AN RA EVEN WHEN HE HAS VISUAL CONTACT WITH THE TFC. IN THIS INSTANCE; IT PUT THE ACFT IN A POTENTIALLY DEADLY PREDICAMENT WHERE SEPARATION WAS PROVIDED STRICTLY BY FATE.