It's emotionally hard for one to accept their own identified group's wrongdoings. For this, I always start with the history of China and then followed by pointe

It's emotionally hard for one to accept their own identified group's wrongdoings. For this, I always start with the history of China and then followed by pointers to US histories, if the conversation flow allows. There is also a persistent danger that this flow eventually leads to political nihilism where there is no meaning in trying to dissecting the historical facts, and everyone is as bad as everyone else. That effectively moves the discussion back to the starting point, i.e., one has to look for something else to settle the original discussion anyway.