They were the particpants of the procession and the video evidence is there for everybody to see. Everyone knows who they are but people do not want to add insult to injury of already bereived people who were victim of a suicide attack.
One thing is for sure, these people who you can cearly see on video will never be brought infront of people, just like may 12 perpetrators were not bright to justice despite their faces cleary seen in videos.
And this is not limited to one sect or party most jaahil people taking part in large gatherings in Pakistan be it religious or political behave the same way. Ransacking banks, shops and setting police vans on fire.
Dont’t try to find excuses for these dickheads.