Greenwald does this often, he has strong, well-researched, thought provoking articles that are impossible to refute - except for the fact that he’ll leave like 1 or 2 facts out that seriously damage his argument. Those anti-lockdown protests often were made up of people that literally thought the pandemic (or plandemic) as they call it, is a hoax, and as such it was very common for people to not wear masks, distance themselves, and even openly and purposefully touching each other. The blm protests I know about have had 100% mask wearing and social distancing.
But the bigger point is this - at the beginning, which is when the anti lockdown protests started, we didnt know much about the virus and were advocating extreme caution. Now, we believe that it is exceedingly unlikely to catch it outside, especially if everyone is wearing masks and distancing.
That is the difference