Rabbi Soloveitchik gave a great deal of emphasis to the plight of Moshe Rabbeinu and how he was denied entry into Eretz Yisrael.
The Rav felt that had עם ישראל shown Moshe the same love that he had for them, he would have entered Israel. Had that happened, the Jews would never have gone into Galut and there never would have been Tisha B’Av.
If the rest of כלל ישראל would have joined Moshe and prayed on his behalf, he would have been forgiven.
Too often, the person who is the constant giver, is often taken for granted. He is also human and has similar human weaknesses. The recipients of the giving, need to learn how to give back. Rabbi Soloveitchik believed that community prayer on behalf of Moshe, could have changed history.