FLC OF AN MLG ACR ACFT FAILED TO CONTACT THE TWR AS DIRECTED BY APCH CTL RESULTING IN LNDG WITHOUT LNDG CLRNC. FLC CLAIMS TCASII DISTR DURING FINAL APCH.

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WE WERE CLRED FOR A VISUAL APCH APPROX 10 MI N OF STAPLETON ARPT FOR RWY 17L. INSTRUCTED TO CONTACT TWR AT 5 DME. AT APPROX 5 DME; TCASII GAVE SEVERAL LOUD TA'S. THE TFC WHICH HAD BEEN IN SIGHT FOR RWY 17R WAS GIVING THE ALERT; BUT THE DISTR OF THE TCASII WAS ENOUGH OF A DISRUPTION TO OUR NORMAL COCKPIT FLOW AT THIS TIME TO DIRECT OUR ATTN AWAY FROM CONTACTING DEN TWR AT 5 DME. AT OUR 1000 FT ABOVE THE GND CALLOUT; WHERE WE CONFIRM OUR LNDG CLRNC; WE AGAIN RECEIVED THE LOUD TA FROM THE TCASII. AGAIN OUR ATTN WAS REDIRECTED AWAY FROM OUR DUTIES TO THE TCASII AND THE POTENTIAL CONFLICTING PARALLEL TFC. DUE TO THE INTRUSIVE DISTRS OF THE TCASII TA'S AT 2 CRITICAL POINTS ON OUR APCH; WE FAILED TO CONTACT THE TWR FOR LNDG CLRNC PRIOR TO LNDG. FOR GOOD REASON THE FAA MANDATES THE STERILE COCKPIT PRINCIPAL TO MINIMIZE UNNECESSARY DISTRS IN THE COCKPIT DURING CRITICAL PHASES OF FLT. THE PRESENT TECHNOLOGY TCASII CREATES JUST SUCH UNNECESSARY DISTRS. WHEN THESE DISTRS CREATE UNWANTED INCIDENTS; THE FLC SHOULD ENJOY THE SAME AMNESTY FROM RESULTING VIOLATIONS AS ARE ASSURED WHEN ALTS ARE VIOLATED WHEN MANEUVERING DUE TO TCASII RA.