Why do you think the director created the scene that way? Its supposed to have that effect. I don't think it touches everyone to the same level of emotional depth, however - some people don't even seem to be affected at all, for most its only a mood-setter - but like you, I am often moved not just to tears, but reduced to sobbing by things in a film that others don't resonate to at all, or at least not much.
I don't know that the emotions of an Autistic are essentially any different than those of anyone else, but perhaps because we have such a difficult time expressing and conveying our emotional life and sharing our feelings with those around us, symbolic representations that we deeply identify with take on a greater significance to us than they do to the neurotypical brain.
Or maybe that's just me.
I mean, I think because I have such a hard time sharing with humans, when I see something or read something or hear something in music that expresses deep feelings that have been pent up or unexpressed for a long time, they just come flooding out and overwhelm me. 