I liked the last point made in the video below.
Various corporations, media & political groups are constantly trying to control the narrative. The narrative that would be most financially beneficial to powerful corporations is that of voter apathy & disenfranchisement. Riling people up & then misdirecting them away from real problems inevitably leads to a sense of helplessness. If this is repeated enough, the entire lower class develops an attitude of learned helplessness where they just give up entirely.
Combine this with the slow destruction of the middle class then you a combination punch. In the US, the middle class always aspired to be part of the upper class. This aspiration has caused many Americans to identify with the wealthy class. We like to watch rich people live their lives on tv and the middle class will fight for tax cuts for the rich (even though it personally harms their own class). Instead, middle class anger gets directed at the working class (i.e., worker unions), the working class anger gets directed at the poor, and the poor class anger gets directed at everyone who is at the very bottom (welfare receipients, homelesss, immigrants, etc).