you know the lead general of operation blue star was himself Sikh.
it was a politically bad decision, and thousands of innocents died, but to imply that it itself was an act of genocide is inappropriate. Sikh extremists militarized a holy place.  
However, after Gandhi was assassinated the Congress government did not do enough to stop and even encouraged violent reproach of the Sikh community leading to pogrom/genocide (the former probably more accurate). So Indria's main role in initiating this was getting assassinated. 

Sikh extremists are responsible for the worst terrorist attack in Canadian history, we deserve a balanced view of these important events, and I don't think we will get it from J Singh unfortunately.