ATC SPACING AND SEPARATION REDUCED DUE TO SYS CAPACITY.

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PEAK HUB ARR AT PIT. 170 KTS FINAL WITH MINIMUM SPACING. AT 300 FT AGL APPROX 1 MI ON FINAL CTLR CLRED THE SECOND DEP FOR TKOF BTWN US AND THE AIRPLANE WE FOLLOWED ON FINAL. GIVEN OUR CLOSE PROX TO THE OTHER AIRPLANE WHO WAS NOT YET ROLLING I DID NOT BELIEVE I COULD MAINTAIN AN ADEQUATE MARGIN OF SAFETY ON THE DEP PARTICULARLY IN THE EVENT OF AN ABORT ON THE DEP OR A MISSED APCH ON OUR PART. I CONSIDERED THE ACTIONS ON THE PART OF THE VETERAN CTLR TO BE INTENTIONAL; CALCULATED AND CAVALIER. IT WAS OBVIOUSLY AN ATTEMPT TO PUSH ACCEPTANCE RATE OVER SAFETY; GOOD JUDGEMENT AND COMMON SENSE. THIS IS THE 4TH SERIOUS INCIDENT I HAVE HAD WITH PIT ATC IN THE PAST 90 DAYS. PIT ATC MGMNT APPEARS UNABLE/UNWILLING TO CORRECT A GROWING NUMBER AND INCREASING TREND OF OPERATIONAL DEFICIENCIES. THE OPERATIONAL MOTTO SEEMS TO BE 'MOVE THE METAL BOYS -- LET THE PLTS SORT OUT THE SMALL STUFF.' ANOTHER EXAMPLE OF THIS IS IN A 30 MIN PERIOD LAST WK 1 LCL CTLR WAS INVOLVED IN 4 (AND POSSIBLY 6) GARS IN A 30 MIN PERIOD. THIS SIT IS UNACCEPTABLE AND MUST BE CORRECTED PRIOR TO THE MERGING OF METAL! CTLRS MUST UNDERSTAND THAT THIS IS NOT A VIDEO GAME; WE ARE REAL PEOPLE AND AIRPLANES SUBJECT TO THE LAWS OF PHYSICS. AT NIGHT DISTANCES AND CLOSURE RATES ARE MORE DIFFICULT TO JUDGE. UNANTICIPATED PITCH AND ROLL RATES CAUSED BY THE PRECEDING VERY CLOSE DEP ARE MORE DIFFICULT TO REACT TO SUCCESSFULLY. THIS SHOULD NOT BE A GAME TO SEE HOW FAR TO PUSH THE PLTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THESE INCIDENTS HAD BEEN RPTED TO THE FACILITY MGMNT. A MEETING HAS BEEN SET UP BTWN ALL INTERESTED PARTIES. RPTR WOULD CALL BACK WITH RESULTS OF MEETING AND IF ANY CHANGES TO ATC HANDLING WERE MADE.