GLF2 FLC INITIATE GAR AS DAL TWR ISSUES GAR; THEN LNDG CLRNC; AS TMB7 BEGINS TKOF ROLL.

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GULFSTREAM 2 (ACFT X) CLRED VISUAL APCH BY DFW TRACON. NEVER CLRED TO LOVE TWR FREQ CHANGE. CHANGED TO TWR ON OUR OWN 4 NM FROM TOUCHDOWN. FOLLOWING A LEARJET (ACFT Y) WHO WAS TOUCHING DOWN JUST AFTER A B757 CLRED THE RWY. BTWN OUR FIRST CONTACT WITH LCL CTLR AND THE LEARJET'S LEAVING THE RWY; LCL CTLR PUT A TBM (ACFT Z; SINGLE TURBOPROP) IN POS AHEAD OF US. THEN HE TOLD US TO BE PREPARED FOR A POSSIBLE GAR. WE GOT TO 500 FT AGL; THE TBM HAD JUST LIFTED OFF AND WE WERE TOLD TO GO AROUND; WHEN THE TBM WAS CLRLY AIRBORNE. WE INITIATED A GAR; BUT IF WE WENT STRAIGHT AHEAD; WE 1) WOULD HAVE OVERFLOWN THAT ACFT; AND 2) LOST SIGHT OF HIM. AFTER BEGINNING EVASIVE MANEUVER TO THE R; THE CTLR CLRED US FOR AN OPTION LNDG. THIS WAS CLRLY IMPOSSIBLE AND WAY TOO LATE. WE PARALLELED THE TBM; PASSED BTWN THE TWR AND THAT ACFT AND THEN PASSED HIM. IT SOUNDED LIKE CTLR TRAINING WAS IN PROGRESS BY THE BACKGND VOICES WE HEARD OVER THE RADIO. THERE WERE ONLY 2 ACFT WAITING FOR DEP AND ABSOLUTELY NO REASON TO BE SQUEEZING DEPS THAT CLOSELY. I COULD NOT AFFORD TO LOSE SIGHT OF THE ACFT IN FRONT OF US. WE HAD A 100 KT OVERTAKE; AND I FELT SURE HIS DEP INSTRUCTIONS WERE TO TURN L AFTER TKOF; OR MAINTAIN RWY HDG. IF HE HAD TURNED TO A SOUTHERLY HDG WE WOULD HAVE BEEN 'SOL.' APCH TO RWY 13L AT LOVE FIELD; DAYLIGHT; CLR WX; VERY LITTLE WINDS. IN THE LAST 3 YRS WE'VE HAD TO MAKE 5 GARS -- 3 AT HOUSTON-HOBBY; 2 AT DALLAS-LOVE. ALL CTLRS SQUEEZING ACFT INTO TOO LITTLE AIRSPACE; WITH CTLR TRAINING IN PROGRESS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR FELT HE HAD TO TAKE THE INITIATIVE ON THE GAR BECAUSE; IN HIS JUDGEMENT; HE WOULD OVERTAKE ACFT Z IMMEDIATELY. SIT DISCUSSED WITH COMPANY; BUT EXPECTED NO FURTHER ACTION.