Those who are evil perish. Nothing is left of them and their works. But the faith of the righteous and the fruit of their deeds, last forever. It no accident the Holtzbergs' orphaned son was named Moshe. There's a biblical parallel to his namesake, who escaped the Egyptian slaughter of the first-born Jewish males. Nothing in the world happens by coincidence. G-d decided to spare the boy. Why? Its one of those things only which He knows and even in the midst of appalling, unspeakable tragedy, there is a miracle. A child has lived.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus