I think it depends on why they don’t wear masks and where they don’t wear masks. Let’s say they are usually in the public and haven’t been vaccinated and believe the whole thing is a hoax and they visit people they know that Covid would kill or at least compromise their delicate health. They visit these people and lied about their possible exposure and whether they have taken the vaccine and led these people to believe they are safe.
They refuse to wear a mask around them claiming they have nothing to fear. Well, then they are evil. This goes beyond indifference or just being naive.
If parents made their child go on some fasting routine that ends up killing or hospitalizing the kid, people would call them a monster. Even if the parents didn’t mean the child actual harm. They would be seen as bad parents and bad human beings.
Whether a person believes or doesn’t believe in Covids ability to harm someone isn’t up to them to decide for others. Covid has killed and hurt many people.
My S-I-L had a friend who he knew since he was a kid. He didn’t believe in Covid. He and his mother both caught it and died. First she went and then him. Oh, and I believe he caught it first and passed it on to his sickly mom. So he had the privilege of knowing he killed her then killed himself.
If you love and really care about the people around you then at the very least you should wear a mask and keep a safe distance from them if that is what they want.