responsibility to sing...? really?
this is just so they can tell the elders to clamp down on and watch the non singers.
apostates are more likely to be soft on the singing IMHO so heres the official framework for why you should harass non singers (just w/o giving the real reason)
or maybe cuz its rather comical when most the hall ( and its only half full already) is not singing... wow the quiet is deafening.
im sure we'll see a local needs on that later this year