Political statements like that can really hurt their credibility as public health officials, especially if increased transmission from protests causes them to call for another lockdown. Either say large, outdoor gatherings like this are risky or they aren't (or maybe they're just slightly risky). Don't get into "protesting these things is ok, protesting these isn't."
Exactly. If all of these civilians where smashed together in Trump rallies or concerts or sporting events, would they have the same petition circulating?