The problem with attempts to controll knowledge, aka limit it, is that it has a tendency to spiral. You limit information about this and that- some zealous partymonger goes astray and limits all the information related. Next you have a famine and because of the involved parties guilt about the dysfunction, knowledge is limited even further. You either have all the information, including the one about retardations going awry in the past. Or you do not and spiral down to become one of those figures in the history lectures doing bizar things, repeating past failures. Looking both ways in this comment. The whole narrative control thing of the left, which is completely blind to physical realities causing problems and makes everything a theater-society-production with a racist villian is almost as disgusting as the ahistoric "isolationism will solve our problems" of the right.