CPR SMT LANDED AT SFO IN WX RPTED BELOW ARPT LNDG MINS.

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OUR PART 91 CORPORATE OP WAS SHOOTING THE ILS 28L AT SAN FRANCISCO. VISIBILITY WAS GOOD EXCEPT ON THE RWY 28'S. THE CAPT WAS FLYING. I WAS COPLT AND RUNNING THE RADIO. WE HAD THE APCH LIGHTS AND ABOUT THE FIRST 2000 FT OF RWY IN SIGHT. BUT TWR WAS CALLING THE RVR LESS THAN 2400 FT (2400 FT IS REQUIRED). AS WE APCHED THE RWY ABOUT 3 MI OUT; TWR AGAIN GAVE US THE RVR (+/- 1600 FT) AND SAID RWY 1 WAS AVAILABLE +6000 RVR AND WE COULD CIRCLE IF WE WANTED. I TOLD THE CAPT THAT 28L WAS BELOW RVR MINS. HE SAID HE HAD THE RWY IN SIGHT AND THAT TOOK PRECEDENCE OVER RVR VALUES. I SAID THAT WAS NOT RIGHT AND THAT WE SHOULD USE RWY 1. WE LANDED ON 28L WITH NO PROBLEMS. AFTERWARDS I DISCUSSED WITH THE CAPT THE RULES REGARDING RVR VISIBILITIES WHEN LNDG. HIS RESPONSE WAS THAT IF ANYONE WANTED TO VIOLATE US BECAUSE OF THIS; THAT DUE TO CONDITIONS (RWY IN SIGHT) THEY WOULD HAVE A FIGHT ON THEIR HANDS. THE PROBLEM: WHEN THE CAPT IS WRONG; HOW DID YOU MAKE HIM DO THE RIGHT THING. I HAVE FLOWN WITH THIS MAN MANY TIMES. HE IS A GOOD PLT BUT HE IS NOT INTO DETAILS (FARS). WHAT HAVE I LEARNED? I AM NOT AFRAID TO SPEAK UP. BUT JUST MAKING A SUGGESTION WHEN SAFETY IS AT STAKE IS NOT STRONG ENOUGH. IN THE FUTURE I WILL HAVE TO TAKE A STAND AND INSIST. IF YOU HAVE ANY SUGGESTIONS FOR A SITUATION LIKE THIS; PLEASE PUBLISH THEM IN YOUR BULLETIN. I AM SURE THAT THIS IS A COMMON PLT/COPLT PROBLEM.