The YouTube description says that it wasn't accepted to any film festivals, with the implication that it was because of political reasons. I think that could well be part of the reason, since the Israeli cause is currently rather controversial, to put it mildly. But part of it could be that it's a very simple film that simplifies a rather complex issue. Of course, you could say that the whole job description of art (or at least, a certain kind of art) is to simplify complex issues, but perhaps this particular simplification simply didn't resonate with any of the film festival curators, and even Bardin's name was not enough to overcome that.

It also requires some familiarity with history and cultural traditions that not everybody has.