Encouraging white guilt is a core plank of the Left's belief system. Without a belief in collective punishment and inherited responsibility, the Left's core ideas of Identity Politics and affirmative action wouldn't be possible.

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The goal of "diversity" and Identity Politics is to base politics (and life, since this is a totalitarian ideology) on group identity, grievance, and marginalization. That way you fracture the civil polity, and make it easier to satisfy and mobilize groups/voters to maintain your power. It has the added benefit of working against creating real opportunities for ending marginalization. Therefore, you're ability to race/gender/etc. pimp these people never ends.

No one who works in the "diversity" industry really wants Dr. King's Dream to ever come true.

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One of the key features of Identity Politics is you need to have a demographic that is deemed "evil" and the cause of everyone's problems. Since Hitler is the most famous Identity Politician we'll call this deemed-evil group Die Juden, but it doesn't have to be Jews. If you want to generalize it you can call it The Other. In American (and most Western) politics this group is heterosexual white males, they are the Left's Die Juden.

You teach the groups you want to "own" that everything wrong in their lives is the fault of these Die Juden. You teach them that if they just eliminated or punished these Die Juden your groups would enter some Utopia. You teach them that only by obeying/voting for you will these groups get the justice these Die Juden have denied them. And if you can get members of the Die Juden group to fell guilty, the easier it is to transfer wealth and power from them to you (not to your groups, but to you and your immediate supporters, aka the nomenklatura).

The goal of this is to build up anger and resentment in your Identity Group against your chosen hated group (Jews, WASPs, etc.) and then use that anger as a way of achieving money/power.