SMA CONVERTS A MISSED APCH INTO A CIRCLING APCH; APPARENTLY; WITHOUT APPROVAL OF APCH CTLR WHO HAD ANOTHER ACFT FOLLOWING ON THE APCH.

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I WAS PLTING AN SMA MORNING TFC PATROL MISSION OVER THE CITY OF BALTIMORE. THE MISSION WAS VFR; HOWEVER; DENSE FOG BEGAN TO ROLL IN AND I WAS FORCED TO RESTRICT THE NORMAL RTE OF MY FLT TO APPROX 60 PERCENT OF THE NORMALLY COVERED AREA. CONDITIONS CONTINUED IN A DOWNWARD TREND. AT APPROX XX20 AM LCL; I REQUESTED A LCL IFR CLRNC TO MTN; ILS RWY 32; FROM BWI APCH CTL. I WAS GRANTED THIS REQUEST. WX AT MARTIN AT THE TIME THE APCH WAS INITIATED WAS ATIS INFO N; RPTED 2 MI AND F CEILING VR. AS I SHOT THE ILS APCH IT BECAME EVIDENT THAT THE F WAS SOMEWHAT THICKER THEN RPTED. I FLEW DOWN TO 20 FT ABOVE MINS AND BEGAN TO CB BACK UP DECLARING TO MTN TWR THAT I WAS GOING MISSED APCH. WHILE CLBING ON ASSIGNED RWY HDG; I BROKE OUT OF THE FOG. AT 550 FT I CLRLY HAD THE RWY IN SIGHT. BEING ABOVE CIRCLING MINS AND HAVING MORE THAN 1 MI OF THE RWY IN SIGHT; BUT BEING ALMOST HALF WAY DOWN THE RWY AND MORE THAN 550 FT HIGH AND CLBING I CALLED MTN TWR RPTED 'RWY IN SIGHT; REQUEST CIRCLE TO LAND 32.' TWR CALLED BACK; IF YOU CAN MAINTAIN VISUAL WITH RWY; APPROVED AS REQUESTED; NOT IN SIGHT. AT THIS POINT I TURNED ON A BRIEF XWIND LEG AND THEN A SHORT DOWNWIND LEG. AT THIS POINT MY FORWARD PAX GOT VERY VOCAL AND VERY FRIGHTENED. HE APPARENTLY FELT THAT ANOTHER ACFT WAS HDG DIRECTLY FOR OURS; HEAD ON APCHING 32. HE BEGAN YELLING TO ME 'THEY'RE RIGHT THERE; WE'RE GOING TO CRASH. THEY ARE RIGHT BEHIND US ON THE APCH.' LATER I LEARNED HE WAS REFERRING TO COMPANY TFC WHO'S PAX HE WAS TALKING TO ON A SEPARATE 2 WAY RADIO; WHO HAD JUST RPTED XING SHORELINE TO MY PAX. WELL; I KNEW FROM ATC THAT PLANE WAS STILL 6 MI OUT SOMEWHERE NEAR CINDI INTXN THE (IAF). AT THIS POINT I HAD NO TIME TO EXPLAIN. I HAD VISUAL WITH RWY AND WAS CONCENTRATING ON MAKING A SAFE LNDG. UPON TURNING BASE AND STARTING MY DSCNT; A CLOSE IN; DSNDING BASE; THAT PAX WAS STILL SHOUTING AND LOOKING PAST ME AT THE APCH END OF 32. NOW; HE STARTS TO YELL; 'PULL UP; PULL UP; WE'RE TOO LOW; WE'RE ALL GOING TO DIE.' I'M ABOUT TO LAND. I HAVE 1 PAX ALL VOCAL AND EXCITED; I'M IGNORING HIM; AND MAKING A SAFE SMOOTH LNDG. THE OTHER PAX FELT COMFORTABLE WITH MY PROC AND TFC PATTERN OF CIRCLE TURN. I BELIEVE WHAT I DID TO HAVE BEEN A SAFE AND CORRECT DECISION BASED ON WHAT I SAW; AND THE INFO I HAD AVAILABLE AT THE TIME. UNFORTUNATELY; I HAD AN ALARMED PAX. NORMALLY; I WOULD NOT CHANGE MY PROC ONCE I DECLARED MISSED. THE REASONS I DID ARE AS FOLLOWS: ONCE I BROKE OUT OF THE FOG; I BROKE OUT CLRLY; HAVING RWY AND MORE THAN 1 MI VISIBILITY AND BEING ABOVE CIRCLE MINS I KNEW I COULD SAFELY CIRCLE BACK AND LAND RATHER THAN GO BACK INTO THE FOG OR TRY TO LAND ON REMAINING RWY AND LOSE ALL THAT ALT SO FAST. I FELT CIRCLING DOWN WOULD BE THE BEST SAFEST CHOICE. ADDITIONALLY; THE TWR APPROVED IT. IN THE FUTURE; I WILL NOT CHANGE MY DECISION ONCE I GO MISSED. I HAVE SPOKEN WITH MY PAX AND EXPLAINED THE REASONS SUCH EXCITEMENT CANNOT BE TOLERATED IN THE FLT DECK. THE APCH AND CIRCLE WERE SAFE AND WELL DONE; HOWEVER; HARDLY NORMAL PROC. IN THE FUTURE ONCE I GO MISSED I WILL STICK WITH IT.