LGT ACR FLC PIC CONCERNED WITH N90 DEP CTLR VECTOR TOWARDS VFR TFC WITH ONLY 500 FT VERT SEPARATION. VFR CLASS B CESSNA INADVERTENTLY DSNDS CAUSING TCASII RA CLB WITH SIMULTANEOUS ATC CLB CLRNC. PIC ALLEGES A PREVIOUS PROB WITH N90 INVOLVING SIMILAR SIT.

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AFTER TKOF FROM JFK; WE (ACFT X) WERE ASSIGNED 4000 FT MSL RATHER THAN THE PUBLISHED 5000 FT. ON DEP CTL; DURING VECTORS TO THE JFK 156 DEG RADIAL; WE WERE ADVISED OF A CESSNA (ACFT Y) AT 4500 FT IN CLASS B AIRSPACE JUST OFFSHORE S OF JFK. THE VECTOR TOOK US DIRECTLY AT THE CESSNA WITH 500 FT CLRNC. BEFORE SIGHTING THE CESSNA; I HEARD THE CTLR INQUIRE FROM THE CESSNA HIS ALT. RADAR SHOWED HIM AT 4000 FT. I SAW THE CESSNA AND ADVISED THE CTLR. HE IMMEDIATELY CLRED US TO 13000 FT; OF COURSE THROUGH THE CESSNA'S AIRSPACE. EVERYBODY'S LEGAL AND EVERYBODY'S STUPID. WE ALWAYS GET A TCASII RA IN THAT SIT. THE FO FLYING INITIALLY ATTEMPTED TO FOLLOW THE TCASII WHICH WOULD HAVE COLLIDED WITH THE CESSNA BECAUSE OF TIMING. 2 IMPORTANT POINTS: 1) WHY DO CTLRS VECTOR 2 ACFT TO WITHIN 500 FT VERT SEPARATION WHEN THERE WAS A LOT OF AIRSPACE AVAILABLE AT THIS TIME OF DAY NEAR JFK? 2) WHEN WE RESPOND TO A TCASII RA; IF ANYBODY WAS OUT OF THEIR SEAT BELTS; NAMELY FLT ATTENDANTS; THEY MOST LIKELY WILL BE HURT. THIS ISN'T THE FIRST NASA RPT ON THIS SUBJECT; BOTH INCIDENTS DEPARTING A NEW YORK ARPT.