So what do they believe in? Nothing. That's why open borders is not a problem to the left. Open borders only troubles those who want to preserve their civilization. We, in this room, want to preserve American civilization, so we don't want open borders. The left has no civilization to preserve, so, of course, they're for open borders.
Tell a man there are trillions of stars in the universe and he'll believe you, tell him there is wet paint on the wall and he'll touch it just to be sure.