PLT OBJECTS TO BEING ASSIGNED A HDG AND ALT WITHIN 300 FT OF KNOWN VFR ACFT AND GETS TCASII RA.

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CLRNC OUT OF SDF WAS RWY HDG WITH A CLB TO 5000 FT. DEP CTL TOLD US TO TURN L (APPROX 270 DEGS) AND CLB TO 5000 FT. SHE THEN SAID WE HAD VFR TFC AT 12 O'CLOCK; 3 MI RPTING 5300 FT. I QUESTIONED HER DECISION OF TURNING US INTO VFR TFC WITH 300 FT OF ALT SEPARATION. AT THAT POINT; TCASII ALERTED 'TFC; TFC.' ALMOST IMMEDIATELY; IT CONVERTED TO AN RA COMMANDING AN IMMEDIATE DSCNT. WE LEVELED AT 4000 FT AND THE RA CLRED. WE WERE SAVED BY TCASII. UPON ARR AT ATL; I CALLED SDF DEP AND SPOKE WITH THE SHIFT SUPVR. WE DISCUSSED THE INCIDENT AND WHILE THIS WAS A 'LEGAL' TURN; IT WAS NOT SAFE OR SMART. AN INTERESTING COMMENT WAS MADE BY THE SDF DEP CTLR. AFTER THE RA CLRED; I COMMENTED THAT I DON'T APPRECIATE A TURN INTO VFR TFC THAT THEY DIDN'T HAVE COM WITH -- WITH ONLY 300 FT OF ALT SEPARATION. SHE CURTLY RESPONDED; 'MY ONLY RESPONSIBILITY IS TO CALL VFR TFC OUT TO YOU.' IN MY OPINION; THIS IS A COMPLETE LOSS OF THE REAL REASON ATC EXISTS; AND THAT REASON IS SAFETY. THIS CTLR WAS SO FOCUSED ON 'LEGAL' COMPLIANCE THAT SHE ALMOST MADE A FATAL DECISION. SUPPLEMENTAL INFORMATION FROM ACN 290322: AT THIS TIME WE WERE APCHING 4800 FT. ALSO; AT THIS TIME OUR TCASII GAVE US A TA FOLLOWED IMMEDIATELY BY AN RA COMMANDING A 6000 FPM DSCNT RATE. WE MADE AN IMMEDIATE DSCNT TO 4000 FT.