Life is not provided on a silver platter, but life, Torah and Mitzvos must continue. When we Jews hear the sound of the trumpet we know that the troubles befalling us are because of our deeds. This introspection and determination to repent and improve our communal and individual ways will eventually stop our misfortunes. Not long ago, I heard an interesting insight from Rav Nosson Scherman into the meaning of this Rambam. Rav Scherman compared this matter to an intersection in one's neighborhood where accidents are constantly occurring.
Someone approaches the government and petitions that they do something about the intersection.
It is simply cruel to preside over carnage and do nothing, when it is within your power to stop the carnage. This is what the Rambam is telling us. Such a community is cruel to its own members. That is cruel. This is not the reaction that the Torah expects from us.