Keep in mind what a leftist, liberal or rightist is today, is radically different than what it was/meant 30 years ago, even 10 years ago (for example, anti-fa, is fascist, violent and leftist - yet they claim to be anti-facist, non-violent and peaceful. At most left vs right protests, the majority of leftists participate in acts of violence while the right does not. They want intellectual conversation, whereas no words of peace are enough for the left protestors. In the videos I linked above, one prominent black-left-siding protester continues to pump himself up on anger, even after elderly rightists tell him they're not racists, and never owned slaves/are immigrants themselves and empathize with and appreciate the circumstances of his struggle, but are tired of the corruption too. He responded by that by threatening to attack them).

Google the "Haldeman Memo" by J. Edgar Hoover; the CIA and FBI were involved in multiple attempts to discredit/set-up for arrest, or assassinate Lennon due to his "revolutionary, anti-war, isolationist, anti-establishment" lyrics - it's all in the FBI documents, part of COINTEL PRO.

http://www.lennonfbifiles.com/

http://www.lennonfbifiles.com/fbi.html

Also keep in mind the Smith-Mundt Act - an amendment was added to it around 2012 that allowed Education systems, MSM and Hollywood to distribute government-funded propaganda to US Citizens, as well as psychological operations, which prior to this, was only allowed on citizens from foreign nations. If you're getting your information from MSM, it's propaganda (left or right).

Lastly, this song is all about how a working class hero is nothing to strive for, as it is pretty much slavery. He clearly states in his lyrics how we're indoctrinated through youth to be peasants (his words) and have our imaginations stunted through society and the system (his words again), instead of tapping into our full potentials. At the end, his finals lyrics state if you want to be a true hero, follow the path he chose rather than that of a "working class hero", or a peasant, working for kings.