As far as I can see, the only thing approaching a coherent theme in TLJ is the question of how one can move forward if encumbered by the past (Finn and Rey also have these issues). This offers perhaps 1% of the thematic and political subtly of the Lucas trilogies. But even this seems a challenge for the script to grapple with coherently -- surely Yoda (presented as a figure of wisdom) should not be using lightning and fire (Sith tools) to destroy embodied wisdom. And if we are to view Luke as doing the right thing then surely the only logical conclusion of this way of thinking is that Kylo Ren is on the right track.
Ironic that Poe Dameron (who destroys most of the Rebellion) is seen negatively when all he was doing was clearing the way for victory by getting rid of all those ships (human lives)!