The protests were outside. People were not hanging around the same group of people face to face for long periods of times indoors with lots of virus circulating. There were a lot of masks being worn. If you look at who is getting this, it is mostly groups of people who spend longer periods of time indoors in close contact with people without masks. Bars. Church services. Large birthday parties. Meat processing plants. It may very well be that because it's really hot right now people in these southern states are spending a lot more time indoors, with the windows shut, with a/c and little to no ventilation. I really don't buy the conspiracy theories.
That said there are a few other factors at play:
1) Huge increases in testing. My guess is the virus has been circulating at a decent rate the entire time. The more we test, obviously the more cases we are going to find. They keep comparing our case numbers to Europe but how many people are being tested there? You don't hear much about that.
2) Symptoms, hospitalizations and serious complications among younger people are very rare, despite attempts by the media to hype them as much as possible. Yes, we still need to make sure hospitals don't get overwhelmed. But otherwise let the virus spread among these people.
3) We've learned a whole lot about how to treat and how not to treat people with this illness. Basically, keep people off ventilators if at all possible. If you have no choice but to put them on a ventilator, they probably weren't going to make it anyway. Drugs and therapies are lessening the severity and death in lots of people. But we are not easing restrictions commensurately. It's gone from saving lives to trying to prevent new cases and that just isn't going to happen no matter what we do.
Keep the spread as slow as we can. We aren't going to stop it or seriously curtail it. Period. That should not be a goal.