The coronavirus thrives indoors, particularly in crowded spaces, lingering in the air in tiny particles called aerosols. If even a few extremists were infected - likely, given the current rates of spread and the crowd size - then the virus would have had the ideal opportunity to find new victims, experts said.
On that basis it seems high risk to have continued the congress after that bunch had entered and left. If that was an NZ supermarket it would have been handled better. Ie; deep clean.
I kind of wonder if some of the non-violent deaths during the rally were covid related. Hope not. Maybe that will come out if so.