And even though he’s telling a story about white supremacy, you are. That’s the glory and also the slight hitch of “Just for Us,” which opened on Monday after runs in London, Edinburgh, Washington and Off Broadway. No, it’s not Ibsen, a dramatist rarely noted for zingy one-liners. But it’s not silliness either. Despite its rabbi-on-Ritalin aesthetic, and its desperation to be liked at all costs, the show is so thoughtful and high-minded it comes with a mission statement. Edelman wants to open a conversation about the place of Jews on the “spectrum of whiteness,” he recently told my colleague Jason Zinoman, “without having a conversation about victimhood.”