It is no coincidence that the definition of "Humanitarian" is someone devoted to the common good and welfare of others.
It reminds me of a story I was told in my youth, the origin of which is likely biblical but i dont know for sure, i'll fill in the gaps here of what i have forgotten over time but the gist is:
A person was one day lementing they were not rich and powerful and had no way to improve the wellbeing of themselves personally and those they knew and loved in the world. A kind spirit passing by heared their words on the wind and whisped them up transporting them to the very depths of hell itself.
There the person saw a glorious banquet table loaded with delicious foods, but there was much wailing of hunger from those sat round it for they all had chopsticks as long as their arms to eat with. Try as they might, they could not bring a single morsel to their lips and all writhed in eternal torment.
The spirit then took them up to the lofty hights of heaven and the person was surprised to see exactly the same scene, a banquet table with chopsticks as long as your arm but those sat round it were happy, content, enjoying each others good company and very well fed... watching further, they saw the people they were not vainly trying to feed themselves, they were cooperating by picking up food and feeding each other.
The selfless cooperation and acting in the interest of their fellows ensured they were in turn taken care of and was the difference in an identical situation being eternal suffering and eternal comfort.
Such is similar with masks and their transmisability reduction factors rather than self defence factors. When all act in the interests of others, they too are defended.