This a very interesting and enlightening thread.
Chairman Mao put into place the criteria you put forward. In Mao The Unknown Story by Jung Chang, it is amazing and depressing how ruthlessly and effectively he put this into action. Also worth noting is that whilst Mao publicly exhorted his subjects to eschew culture he very much enjoyed it; in private !
The Ayatollahs of Iran do the same as well. I have a friend from Iran, he said to me the other day that the people of Iran now realise that have swapped one dictatorship for another, and that they want to rid themselves ot it.
I now have four tests as to whether an organisation is about control. Is it homophobic, racist, misogynist ( i know of of no misandrist group) or anti education? If it exhibits one of these traits, and often all four are present, you can be sure they are about control. Often they are anti culture too, as culture very often challenges people to think, thus undermining the group.
This does come through in their attitude toward children as well
Thus to answer your question, they are for more concerned to protect themselves because they see an admission of complicity or omission,as weakening themselves.
Regards David