Its statistical.
Wearing a mask doesn't guarantee you, or anyone else, is safe. Likewise, NOT wearing a mask doesn't necessarily mean you, or anyone else, is doomed to catch the bug. But it does improve the odds for everybody in both cases.
Its like wearing a seat belt, or quitting smoking. Don't let the perfect be the enemy of the good.
But deliberately not wearing a mask just to make a political point is irresponsible and vicious. Those people are low-life scum and deserve to die gasping for breath.