Correlation can mean causation sometimes, sometimes not. You have to look at the data and all the variables involved. We know covid 19 is passed from person to person. We know that average time from exposure to symptoms is 5-6 days. Florida reopened on May 4. New cases were flat for all of May. Protests started end of May. New cases start rising in first week of June, and by second week of June setting new records.
Some new cases are coming from reopening, but the large spikes did not happen until after the large protests. Contact tracing is impossible in a marching crowd of 100,000. That's a red herring which you probably know.