Who said those were not problems? The Democratic Party was already addressing those without Critical Theory.
Critical Theory sets up an eternal conflict between Oppressor and Oppressed classes, with the definitions being completely fluid. Everything about the Oppressor is considered evil, everything about the Oppressed is considered good. Even if the Oppressor does "good," it's still evil because it's only done for the benefit of the Oppressor. By the same stroke, whatever the Oppressed does against the Oppressor is good, but any form of compromise or treaty or reconciliation with the Oppressor is bad.
Western society in some Critical Theory teachings are white people, but the more recent classification is "Colonizer." Christianity is considered a Colonizer tool, and thus despised for that reason. Israelis are also considered Colonizers. And by the same stroke, because Israelis are the Colonizer/Oppressors, then Muslims are the Oppressed. Whatever Muslims do, no matter how vicious, is a righteous reaction to the Oppressor. Any violence against the Oppressor is righteous.
Once you understand that it's all Critical Theory, it makes perfect sense from that viewpoint.
Moreover, Critical Theory is self-acknowledged Marxist...the creators themselves proudly said so. So, we saw the same concept in the Chinese Cultural Revolution when students became incredibly violent to erase all manifestations of the Oppressor--Imperialism in their case--from China. Suddenly, "Physics is Imperialist."