I agree that outdoor mass gatherings are not a good idea, even with masks. It remains to be seen how many people become infected as a result of attending BLM rallies. The problem is that protests are protected by the First Amendment. Were any protests against lockdown shut down because of the virus?
A February soccer match in Italy has been dubbed a “biological bomb” because it’s linked to the outbreak there. But indoor mass gatherings are much more risky. Trump (or perhaps his campaign) has said that he’s not willing to play to a non-packed audience. Add to that his disdain for masks, and the Tulsa rally is likely to become a superspreader event.