I was on the fence about attending a protest an hour away. Ended up not going. But I would absolutely be wearing a mask, at a distance from everybody else (look at what they did in Tel Aviv), and in the camp of "take this seriously, stay at home when you can (not ironic, I consider the protest important), take personal responsibility to save lives AND make room for people who have to work to maintain their livelihood, wear a mask and otherwise maximize safety when you do return to work". (Hard to fit that all on a sign, of course.)
Reasons would be: 1) Don't you dare tell me protests are "non-essential" activities (see Raleigh PD) 2) Let people decide if they want to work. People are already quite cautious at this point. (I say this with some hesitation, which is one part of why I didn't go)
There are important issues of health, economy, and government power grab. Most people on all sides of the issue seem to pick only one or two.