AGNIESZKA PIKULICKA-WILCZEWSKA and KUBA STEZYCKI THOUSANDS of Poles marched through Warsaw and other cities to show their support for the late Pope John Paul II in the face of what they said were false allegations that he concealed child abuse in the Catholic Church. The ruling Law and Justice (PiS) party faces a tough election later this year, and other religious conservatives have said any calls to re-examine his legacy amount to a plot to discredit the nation's biggest moral authority. That argument resonates strongly with many older Poles who John Paul inspired to stand up to Communism in the 1970s and '80s, although…