History records that Karl Marx had a fierce disregard for Thomas Malthus and his theory. Blaming the poor for their poverty was just not on for the socialist revolutionary from Trier, Germany. The system---capitalism---was to blame for everything. Dump capitalism, institute socialism, and people will presumably stop bonking. For Frederick Engels, socialism was like salt peter, it alone "makes possible that moral restraint of the propagative instinct which Malthus himself presents as the most effective and easiest remedy for over-population."