ATCT LCL CTLR INSTRUCTED A C172 TO HOLD SHORT OF TXWY A FOR AN ACR DC9 TAXIING ON TXWY A. THE C172 STARTED TO CROSS THE TXWY WITHOUT A CLRNC AND THE DC9 HAD TO SWERVE TO MISS THE C172. SUBSEQUENT PHONE CALL FROM THE SPI IN THE C172 INDICATED HIS INSTRUCTOR HAD TOLD HIM TO 'HELP' THE TWR WHEN HE FELT HE COULD AND THAT WAS THE FBO POLICY. THE DC9 PLT WAS ANGRY WHEN HE CALLED THE TWR. RPTR ALLEGES THAT FACILITY MGMNT IS AWARE OF THE PROB; BUT HAS DONE NOTHING TO CORRECT THE FBO POLICY.

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C172 IS PART OF A SMALL FBO WHO TRAINS NEW PLTS. THE ACFT HAD BEEN OPERATING IN THE TOUCH-AND-GO PATTERN. THE STUDENT AND INSTRUCTOR WERE ON BOARD. THE CESSNA MADE A FULL STOP ON RWY 17. THE STUDENT WAS INSTRUCTED TO TURN R AT TXWY G AND HOLD SHORT OF TXWY A FOR A TAXIING DC9 ON TXWY A. THE STUDENT READ BACK THE INSTRUCTIONS. THE CESSNA TURNED ONTO TXWY G FROM RWY 17 AND APPEARED TO SLOW DOWN. THEN IT WAS OBSERVED TO SPD UP TOWARD TXWY A PUTTING IT INTO A COLLISION COURSE WITH THE DC9. THE ATC SPECIALIST INSTRUCTED THE CESSNA TO STOP. THE CESSNA DID; BUT HAD CROSSED THE HOLD LINE. THE DC9 HAD TO MOVE TO THE R OF TXWY A TO GET BY. WHEN ASKED ON THE RADIO; THE STUDENT DID STATE HE HAD HEARD AND UNDERSTOOD HIS INSTRUCTIONS. THE STUDENT CALLED THE TWR; AS INSTRUCTED. IN THE CONVERSATION HE STATED HIS INSTRUCTORS HAVE TAUGHT HIM TO 'HELP OUT' THE CTLRS WHENEVER HE FELT HE COULD. HE WAS CERTAIN HE COULD 'BEAT OUT' THE DC9. THE INSTRUCTOR SUPPORTED THE STUDENT'S VIEWPOINT. THE DC9 PLT CALLED; UNSOLICITED BY US; AND HE WAS ANGRY. THERE ARE WAYS TO 'HELP OUT;' ACCURATE POS RPTS; ETC; BUT NOT FOLLOWING AN ATC INSTRUCTION IS NOT HELP. NEITHER THE INSTRUCTOR NOR STUDENT WOULD AGREE WITH THIS. THIS IS A CONTINUAL PROB HERE WITH THE FBO'S; AND THE POTENTIAL OF AN ACCIDENT ONLY GROWS WORSE IF IT CONTINUES. ATM REFUSES TO HELP CORRECT THIS OR ACKNOWLEDGE IT AS A PROB.