Luke throwing away his lightsaber (a symbolic foreshadowing of the burning of the Jedi archives in The Last Jedi)

I think you can draw a common theme from both, but it's that Luke rejected the teachings of the Jedi for his family. First by choosing nonviolence when confronting his damned father, despite his teachers' warnings, then by burning the teachings of the religion that saw both Anakin and Kylo fall.

There are certainly leftist themes in the The Last Jedi scene, but not ones foreshadowed by Return of the Jedi's.