I saw this really take off around 2010 and tried to warn people. The issue is that the forces that actually control the major political parties need to divide the people, for never forget the thing the oligarchs fear the most is a united proliteriat, and have heavily invested in creating the illusion of a consesus or narrative view from one "side" or the other, reinforcing the division at play.
Three letter grade psyops are at play on an unprecendented scale, and failing to understand that will leave anyone interested in this topic twirling at windmills.