What is a facial mask useful for?

The hole of facial mask is small enough to block the passage of virus? Borrowing the saying by the representative specialist in Virology in Osaka Prefectural University, Masayasu Inoue, PhD, it is equivalent to trying to prevent mosquito invasion through wire mesh of the chicken coop. So, facial mask wearing is nothing to do with any prevention from viral infection or it's scattering to outside. Though it is said that wearing facial mask that we are doing habitually as a common sense recently may prevent saliva sprashing, it has nothing to do with the passage of viruses whose size order is completely different, the actual size is only 0.1 micron, 1/10,000 mm. 

Again I wanna put an emphasis on the point that wearing facial mask has nothing to do with preventing viral infection, saliva sprashing and viral infection are different affair at all. In addition, the amount of Oxygen to be invited into our body through respiratory breathing action is reduced from 21 % to 17 % by wearing facial mask and the lack of Oxygen content supply in blood flow causes the reduction of Immune ability. So a prevailing strange habit, a facial mask causes no good things. Prayer and magic are done to get rid of anxiety and gain peace of mind, we should not take the Vaccination as the Savior. Contraly, we can distinguish it as an awful Satan that remake our body intruding into our Gene and Cell Therapy, in addition we cannot come back as before once the operation is performed, no way to be survived as before. 

"Horrible Human Remaking Experimentation is Now in progress!", no matter how we understand it or not, the result of Madness of Violence is coming soon! Bad news are reported everywhere in the world.