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Because of Kamtza and Bar Kamtza, Yerushalayim was destroyed. (Gittin 55A)
Marshah says that the Baal Habayis should have never listened to Kamtza who was the farther of Bar Kamtza and throw him out the banquet-rather he should have made peace between them.
Whats-more it says ???? ??? ?????? ?????? ????-a person needs to be very accurate in his language. As it says in Chazal ????? ?????? ??????? the Sages were careful with there words- The listener also has to pay attention to the words he hears-as because Bar Kamtza misheard one letter the Churban resulted.
(Ben Yehoyoda)