ACR MLG CAPT COMPLAINT ABOUT VISUAL PARALLEL APCHS TO SFO.

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ORD-SFO WAS RE-ROUTED FROM MINA APCH GATE TO OVER POINT REYES GATE. FROM POINT REYES WE WERE SLOWED TO 210 KTS AND DSNDED TO 7000' ON A 120 DEG HDG. WE WERE THEN SLOWED TO 170 KTS THEN TURNED TO 250 DEGS FOR A PARALLEL VISUAL TO RWY 28R. SEP LOOKED GOOD FROM ACFT ON FINAL FOR RWY 28L; HOWEVER THE RWY 28L TFC WAS A HVY JET AND SEP WAS TOO CLOSE. ATC REQUESTED US TO INCREASE SPD SO AS TO PASS THE HVY ADVISING 200 KTS WOULD GET US PAST THE TFC. WE INCREASED TO 200 KTS WITH NO VISIBLE CLOSING. WE FURTHER INCREASED TO 220 KTS AND JUDGED THAT CLOSURE WOULD BE TOO SLOW TO OVERTAKE THE RWY 28L TFC AND STILL BE IN A SITUATION TO LAND ON RWY 28R. I REFUSED THE APCH REQUESTING A RIGHT 360 DEG TURN OR VECTORS FOR A SECOND; PROPERLY SPACED APCH. THE SECOND APCH WAS FROM 3000'. TFC WAS POINTED OUT TO US. WE IDENTED AS BEST AS POSSIBLE IN THE DARK. WE WERE CLRED FOR THE APCH TO RWY 28R AND TO MAINTAIN VISUAL WITH THE TFC FOR RWY 28L. WE CONFIGURED THE ACFT FOR FINAL APCH FLAPS AND SPD. I WAS FLYING THE APCH AND MY F/O KEPT A CLOSE WATCH ON THE TFC WHICH SEEMED GLUED TO MY LEFT WINGTIP. I WONDERED IF PERHAPS THE TFC ON RWY 28L WAS ATTEMPTING TO MAINTAIN VISUAL WITH ME AS WELL; WHICH AMOUNTS TO HAVING 2 ACFT IN FORMATION AND NEITHER KNOWING WHAT THE SLOWEST SPD COULD BE. I AM NOT COMFORTABLE WITH FORMATION NIGHT FLT; ESPECIALLY IN TRANSPORT ACFT IN LNDG CONFIGN. THE PARALLEL CLOSELY SPACED APCHES TO RWY 28L/R AT SFO ARE AN ACCIDENT WAITING TO HAPPEN. THE PROB DEVELOPED I FEEL BECAUSE THE CTLR TURNED ME TOO SOON TO FOLLOW A HVY. ATTEMPTING TO CORRECT HIS ERROR EXCEEDED THE SPD CAPABILITIES OF THE ACFT PLACING IT TOO CLOSE; TOO FAST TO EXECUTE A STABILIZED SAFE APCH. THE SECOND APCH IS EQUALLY UNSAFE IN CONDONING FORMATION FLT OF TRANSPORT ACFT WITH WIDELY VARIABLE SPD ENVELOPES. PLS GENTLEMEN; SOMETHING MUST BE DONE AND SOON TO HAVE A NATL CRITERIA ESTABLISHED FOR CLOSELY SPACED PARALLEL APCHS. SFO NEEDS ATTN AS WELL AS DEN RWY 26L/R 25 APCHS.