I actually don't wear a mask to prevent myself from getting COVID. I wear a mask for the sole reason that if I have COVID, and am asymptomatic, I want the chances of me spreading it to be as low as possible.
I work as a public defender and I am around clients who are in legal custody on almost a daily basis. Why is that relevant? Simple, here in Texas our county jails have become COVID hotspots and I know that I have a very high likelihood of catching COVID. I have to take that risk in order to feed my family, but if wearing a mask even infinitesimally lowers my risk of potentially spreading COVID to others, it is worth it to me.
To each their own.