Liberals attempt to make this kind of deranged PC thinking credible by assigning what I call "Original Sin" to the villain classes. Please ignore the religious connotations and stick with me for a moment.
Original Sin as defined in this context:
The group of people who were the first to commit an act of evil, and were responsible for all other acts of retaliation since then are guilty of committing the Original Sin.
So if you are part of a group of people who committed the Original Sin, you are guilty for all time and can never redeem yourself or wash the guilt off your conscience. To assign the Original Sin to a group the liberal will go back in time as far as they need to find an example where the villain class did something wrong. They will then stop going back in time and ignore all other events in history that led to that moment and declare that single act the Original Sin which set in motion all evil to follow and justifies any atrocity committed by the victims classes since then.
Example:
Dozens of Swedish girls get raped by Muslims.
Go back in time to the founding of Israel which is seen as an unjust act, while ignoring the bloody past of Muslims in the Middle East before then, and declare that the Original Sin.
Blame any atrocity committed by Muslims on the Israeli Original Sin.
Obama did this when Muslims cut off 21 Christian heads, and he went back in time to the Crusades and told us to get off our high horse. White Privilege is another version of Original Sin. It's all over the place.
The PC rule book supported by cherry picking horrible acts committed throughout history by the villain classes is the political engine which drives our society today.