Logic?

If you aren't wearing a mask because there's no proof they work:

There's no proof masks cause harm, so until there is, I'm going to keep covering my face to prevent the government and corporations from monitoring me. Most people don't even realize how heavily monitored we are. The fact that you're reading this here on the internet means there's probably already piles of very specific data about you collected somewhere. Do you really want your face to be part of that? I'm covering mine for as long as it's socially acceptable 😷

If you think that the virus was an intentionally released biological weapon:

If you ignore warnings to protect yourself, isn't that like running into a bomb? Assuming this is something done to intentionally harm people, the best route would be to avoid harm (in this case by staying out of the chain of infections), to thwart its purpose. Wouldn't whoever's behind this be mad when nobody gets sick as they had intended?!