NMAC AVOIDED BY TCASII RA COMMANDING EVASIVE ACTION CLB.

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AT CRUISE; FL210; CLRED DIRECT AQN; ACTON 2 ARR; CROSS HALEN INTXN AT 11000 FT. CTLR ADVISED US THERE WAS AN UNIDENTED ACFT OVER THE AQN VORTAC; CLBING SOMETIMES HIGHER THAN 14000 FT. WE IDENTED THE ACFT ON OUR TCASII AND ADVISED CTR. CTLR TOLD US TO WATCH OUT AND BE CAREFUL AND CLRED US TO APCH CTL FREQ. WE CHKED IN WITH REGIONAL APCH AND TOLD THE CTLR OF THE SIT. HE SEEMED UNAWARE. THE TCASII TARGET CAME CLOSER AND CLOSER AT A RAPID RATE. TCASII THEN COMMANDED A 3500 FPM CLB. I BROKE OFF THE DSCNT IMMEDIATELY AND BEGAN A 4000 FPM CLB. THE LAST LOOK AT OUR TCASII HAD THE TARGET UNDER US AT 400 FT. WE TOLD APCH WE HAD A TCASII RESOLUTION AND WERE CLBING. LITTLE OR NO CONCERN BY APCH CTL; JUST TOLD TO CONTINUE OUR DSCNT WHEN ABLE. WE NEVER HAD A VISUAL CONTACT. PRIVATE PLTS CERTAINLY HAVE THEIR RIGHT TO BE IN THE SKY TOO. HOWEVER; ALONG WITH THAT RIGHT COMES RESPONSIBILITY. THEY MUST BE MADE TO BECOME COGNIZANT OF WHERE THEY ARE FLYING OR HUNDREDS OF LIVES WILL BE LOST. THANK GOD FOR TCASII. AT LEAST WE HAVE A FIGHTING CHANCE AGAINST THE IGNORANT.