Charles H. Spurgeon on Psalms 109:12

Let there be none to extend mercy unto him. He had no mercy, but on the contrary, he crushed down all who appealed to him. Loath to smite him with his own weapon, stern justice can do no otherwise, she lifts her scales and sees that this, too, must be in the sentence. Neither let there be any to favour his fatherless children. We are staggered to find the children included in the father's sentence, and yet as a matter of fact children do suffer for their father's sins, and, as long as the affairs of this life are ordered as they are, it must be so. So involved are the interests of the race, that it is quite impossible in all respects to view the father and the child apart. No man among us could desire to see the fatherless suffer for their deceased father's fault, yet so it happens, and there is no injustice in the fact. They share the parent's ill gotten gain or rank, and their aggrandizement is a part of the object at which he aimed in the perpetration of his crimes; to allow them to prosper would be an encouragement and reward of his iniquity; therefore, for these and other reasons, a man perishes not alone in his iniquity. The ban is on his race. If the man were innocent this would be a crime; if he were but commonly guilty it would be excessive retribution; but when the offence reeks before high heaven in unutterable abomination, it is little marvel that men devote the man's whole house to perpetual infamy, and that so it happeneth.