CAPT OF AN MLG ACR ACFT CHALLENGES THE TWR REGARDING THE SAFETY OF RELEASING CLRING ANOTHER ACFT FOR TKOF ON AN INTERSECTING RWY.

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ON SHORT FINAL AS DESCRIBED ABOVE; AN ACFT ON THE XING RWY 31 WAS CLRED FOR TKOF. SINCE I WAS FLYING AND IN THE PROCESS OF ROUNDING OUT FOR TOUCHDOWN; I LOOKED (GLANCED) OVER AT WHERE THE ACFT FOR TKOF WAS. I COULD NOT TELL; AND THE THOUGHT THEN WAS 'SURELY THE CLRED FOR TKOF ACFT CANNOT REACH THE INTXN OF THE RWYS BEFORE WE DO' -- I HOPE; SINCE OUR ONLY CHOICE WAS TO GAR BELOW 50 FT AND FLY THROUGH THE INTXN. AFTER SLOWING ON THE ROLLOUT; THE CTLR WAS QUERIED. SAYS HE; 'NORMAL PROC; YOU GOT A PROB; CALL THE TWR.' I SPOKE WITH THE TWR SUPVR. GOT A BUNCH OF MUMBO-JUMBO ABOUT TXWY U AND TKOF CLRNC BEING ISSUED SINCE ACFT 'IN POS' COULDN'T SPOOL UP; ACCELERATE; AND REACH THE INTXN BEFORE THE LNDG ACFT HAD CLRED. THIS MUST BE DONE TO EXPEDITE TFC. ALL OF THE ABOVE WAS AND IS TRUE. I AGREED BUT WE WERE; AT BEST; OVER THE APCH LIGHTS WHEN CLRNC WAS ISSUED FOR XING ACFT TO TAKE OFF. THE SUPVR SAID; 'IF THAT IS TRUE; I WILL HAVE TO DISCUSS IT WITH THE CTLR.' TO FURTHER CLARIFY; OUR ACFT TOUCHED DOWN; ON SPD; ON THE 1000 FT MARKS; SO THAT SPD WAS NOT AN EXTRAORDINARY FACTOR. I POINT THIS OUT SINCE THE SUPVR INDICATED THAT TKOF CLRNCS WERE ISSUED WITH ACFT STILL AIRBORNE SINCE THEY (TWR) COULDN'T CTL WHERE ACFT LANDED. OBVIOUSLY; BOTH TWR PERSONNEL WERE QUITE DEFENSIVE; AS THEY PROBABLY SHOULD HAVE BEEN.