Moltke (both the elder and the younger) were followers of the teachings of Clausewiz. Which until this day have been proven right every time someone applied them correctly or incorrectly.
Read "On War" and you will understand that the most humane and economic way to wage a war is to use all available force to make it end as quickly as possible. Clausewitz also predicted the difficulty of using a military force to fight in asymmetric warfare. Moltke the elder knew with certainty that a guerilla war in France would be a bad idea, which was exactly why he didn't want to let Napoleon III go after Sedan.
Sapience=/=Sentience