There's almost certainly a lot of safe opening up we could do. What would make it dramatically safer would be pro-social behavior from people on the right. The protesters are all wearing masks and doing their best to maintain social distance outside of the actions. They calculate that it is worth the risk. Time will tell, but the calculus isn't merely do the protests increase the spread? but also will they achieve political goals that have a large bearing on public health, specifically the health of people whom the US Coronavirus response is already systematically failing (black people, whose lives matter).