Trump is a fascist overlord who cries like a small child because that's exactly what he is. Nobody likes him except his mostly-white male following of ignorant sycophants who like thinking they know more about the world than they do.

I read it as they needed to leave civilisation to return to the relative safety of the wilderness, I thought the movie was less about politics and more about nature. I think you're reading in the "huge propaganda" relating to immigration.