I may have missed some posts on this, but here's the bottom line. Anyone who cares about one's friends, family, neighbors and citizens, in general, would wear a mask in public or in private, where social distancing can't be easily maintained, both to protect the wearer and everyone else, in case that person is infected. The WHO guidance is poorly done, just like some previous guidances (like the mask flip-flops).
The bottom line is that the WHO communication was woefully inadequate. Yes, transmissions from people who are infected and asymptomatic and remain asymptomatic (maybe 30% of all infections) are less common (but nowhere near zero) than transmission from infected and asymptomatic patients who go on to develop symptoms and illness (~70% of infections), i.e., "presymptomatic" patients. Transmission from such patients is highest just before symptoms develop, as per the excerpt below, from a paper in Nature, one of the premier scientific journals in the world.
https://www.nature.com/articles/s41591-020-0869-5
"We observed the highest viral load in throat swabs at the time of symptom onset, and inferred that infectiousness peaked on or before symptom onset. We estimated that 44% (95% confidence interval, 25–69%) of secondary cases were infected during the index cases’ presymptomatic stage, in settings with substantial household clustering, active case finding and quarantine outside the home."
Since people are unable to know if they're infected but presymptomatic, concern for one's fellow citizens dictates that people should wear masks, which have been clearly demonstrated to greatly reduce transmissions of the virus. I struggle with understanding how everyone cannot understand this. Are people saying "freedom" from being told what to do is more important than potentially infecting and killing someone else? If so, that's a sad statement.