Article Response

I found the whole introduction quite interesting, with beginning of Dada and performance art, introducing the idea of the public being a work of art.  They used one example of getting hundreds of people, or "actors" as they might call them, to gather and sing songs that the artists composed and directed from rooftops.

I thought this was great, but the only part I do not understand is the fact that they keep stressing trying to narrow the gap between the participants and the spectators.  Obviously everyone is not going to fall head over heels for performance art, and may even feel uncomfortable doing it.  If it's more participants they want, not spectators, then they should advertise their event more effectively.

Why do they care so much about the spectators activity level?