Why does mr.frank say that the loud air raids should be music to the ears of those kidding in the attack?

Mr. Frank suggests that the loud air raids should be music to the ears of those carrying out the attacks because it indicates that the Allies are advancing and fighting back against the enemy. The noise signifies hope and resistance, as it means that liberation is on the horizon. In this context, the air raids symbolize a challenge to the oppressors, providing a sense of optimism for those suffering under tyranny.