If masks work, and you always wear one, you have nothing to fear from those that don’t wear chin diapers.
It’s not a switch - as if you’re protected or you’re NOT protected.
If person X wears a mask, it protects person X to some extent. If person Y wears a mask, it ALSO protects person X (as well as person Y) to some extent.
Thus, if both people wear masks, both people are better protected. HOW well protected, again, depends on what kind of mask both people are wearing, how long they’re in each other’s proximity, where they are, and, of course, whether either of them have the virus or not.
Since the virus travels in droplets from coughing / sneezing / talking (or perhaps just breathing!) anything one can do to reduce those droplets from hitting the air would seem to me to be a good thing. As far as I’m concerned, people whining about “face diapers” are simply being selfish, and those claiming that “everyone should get the virus!” are dangerous fools who don’t seem to give a damn how many older people drop dead because of it.
Where I think our government failed (and this includes you, President Trump) is that they should have sent everyone in the country a box of masks. More people would wear them if more people HAD them to begin with. I certainly remember going a month or so before I could get hold of one. Perhaps if that had happened, more people would have worn them months ago and we’d have this thing stomped down by now.