Actually, this is not trivial BECAUSE of everything going on. More people are walking because that’s all many of us can really do right now. And with more people on the sidewalk, keeping social distance means more walkers may be using the diamond lanes to pass each other. In response to the OP, I am sure you do not want to cause harm, so if necessary slow down until you can safely move over. They may even take that as a hint. They may be technically breaking the rules and putting themselves in danger, but that should not be a death sentence, IMHO.