You appear to have no real knowledge of Chinese history, perhaps as bad as that (not) taught in China. Around 1960 when the famine and related purges occurred the population was ~650M so even with the high end of 30-45M dead of starvation over 3 years, it's a few percent. It's horrifying to be sure, but it was concentrated (for political reasons they were exporting grain) in the west and central China where food was grown, while the major population centers were largely spared (still almost 1% died). So no, not every person alive in 1960 was involved in some sort of genocide, or even aware of it. The political elite of course suffered relatively little (until 60-80% of them were in turn purged less than 10 years later), but they were also (as usual) a tiny minority <3% of the population. This purge was called the Cultural Revolution also driven by Mao. Then came Deng, and now Xi. With some periods of relative political complexity in between.
Please study some history and stop assuming literally everyone is evil. That leads to the very expectations, political apathy, and actions that allow this kind of situation. It's unhelpful.