ACR X GPWS NON ADHERENCE TO ATC CLRNC. EVASIVE ACTION CLB.

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ACR X BEING VECTORED FOR A VISUAL APCH TO RWY 25L. LEVEL AT 6100 FT MSL AS CLRED. AT APPROX 5-6 MI OUT ON BASE FOR RWY 25; RECEIVED A GPWS ALERT 'TERRAIN; TERRAIN.' FO WAS FLYING AND EXECUTED A PULL UP. WE THEN COULD SEE THE TERRAIN THAT WAS CAUSING THE PROB -- A 5092 FT PEAK. AT ABOUT 6500 FT; FO LEVELED OFF. WE WERE GETTING TOO HIGH TO MAKE THE APCH. THE GPWS WAS STILL SCREAMING 'TERRAIN; TERRAIN;' APCH WAS GIVING HDGS. VISUAL APCH CLRNC; SWITCHOVER TO TWR. WE ALSO HAD LIGHT-MODERATE CHOP. THE GPWS FINALLY QUIT AND WE MADE A STEEP (6500 FT 6 MI OUT!) APCH TO RWY 25L. MVA WAS 6100 FT OVER THAT OBSTACLE; WHICH IS STEEPLY RISING TERRAIN. THE MVA SHOULD BE RAISED TO 2000 FT ABOVE THE OBSTACLE. UNNECESSARY EMER PULLUPS CAN HURT FLT ATTENDANTS AND PAX. ALSO; LAS SHOULD QUIT GIVING 'HIGH DIVES' TO EVERYONE. EVERY TIME I GO IN THERE I GET A 'HIGH DIVE.' WHY? IS THIS REALLY NECESSARY? THE GPWS PROB ALSO OCCURS AT SAN; LAX; BUR; MFR; SLC; AND ASHEVILLE; NC TO MY KNOWLEDGE. MINIMUM VECTORING ALTS ARE NOT PROTECTING THE PLTS.