Lesson the US military eventually learned in Vietnam after camera and television technology had matured to the point the general public got to witness weapons of mass destruction in use. Until that point there was no real backlash whenever the US military fire bombed entire cities. In the WW2 Pacific theater the US killed over a hundred thousand civilians at a time fire bombing Japanese cities and no one gave a fk but when the public watched on their living room televisions the same tactics being used in Vietnam there was backlash.
I guess the lesson learned was that after the advent of video mass media you gotta only kill hundreds of civilians at a time and if you do shit like depoy a weapon that kills tens to hundreds of thousands at a time the public starts getting squeamish.
During and shortly after the revolution. They fkd around afterwards, father got locked up and family got sent to the rural countryside for reeducation. After serving the prison sentence, his father did eventually redeem himself but it left a mark. This experience in adolescence is supposedly what caused Xi to develop a hard-line reder-than-red Marxist-Leninist world view and aversion to corruption when others he grew up with fell down the liberal rabbit hole. This is at least what his CIA dossier outlined as family background and early life.