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Originally, "Get Back" was supposed to be a protest song.
In the UK at the time, and in other countries certainly, there was a rise of anti-immigrant sentiment on the right with people like Enoch Powell (Britain for Britons and all that). Get Back was supposed to be a tongue-in-cheek satire on that, talking about how people should "Get Back" to where they belong.
The reason this was dropped was because it was feared people wouldn't get that it was satire and would take it at face value as racism. The song wasn't even heard until a bootleg surfaced in 1986.
So, what if Get Back was released as originally conceived as a tongue-in-cheek bigotry protest song?