I agree if your in a walk a park with no one say 30 feet from you, you don't need a mask.
However, it has been shown that just breathing or talking releases particles of the virus into the air. How far it goes is not known, although 6 feet is the standard to assume.
N95 masks on Amazon (at least in the US) can only be sold to medical folks). We have a massive shortage of masks in almost all states for first responders, hospital nurses, and folks in nursing homes. Therefore N95 and surgical masks should only be used by the public once there are enough for health care professionals.
It should be the law - where it isn't - that if you are in a public place where maybe near others, at least a cotton mask should be required based on the public health threat far outweighs any rights you selfishly want to claim and be a jerk putting others at risk.
The problem as everyone knows by now is YOU may have the virus but be perfectly healthy but can pass it on to someone else. Any mouth covering prevents most of your breath from going out into the air that could unknowingly infect someone else.
N95 is the only real protection for the hospital worker since "95" relates to it being 95% effective in filtering out tiny particles like the virus. It actually is a respirator mask with a filter cartridge air passes through.
A "surgical mask" (often blue you may see) is something like 40-50% effective or less. I forget the exact amount.
The point of cotton or any other mask is while it is 0% effective in protecting YOU (since the virus is small enough to pass through), it protects everyone else from getting the virus from your breath - especially since it seems 50% of those with the virus are asymptomatic.. They are the lucky ones, but the other 50% may get a severe infection and even die.
There are new reports of young men with no preconditions that are dying from the virus. The numbers are small but relevant. One theory is that younger immune systems are more robust. The strong immune response is now believed to cause the virus to be worse since it is so intense it kills off good cells as well as bad.
Most recently, a significant number of young men (one study of 30-40 yr olds) had no symptoms until they had a massive heart attack or stroke while at home. It seems to be related to the virus, causing blood clotting either near the heart of in the brain. What is unusual is the clotting is in the veins (returning to the heart), not the usual clotting in arteries. Why is a mystery to Drs and scientists at this point.
One surgeon reported while removing a clot from the brain of a young person; he could see new clots forming as he removed the original clot. He said he has never experienced that before.
Sadly the virus is a mystery to most medical experts since it seems to behave much differently than prior similar viruses and is more easily spread just by someone breathing near you. Thus, everyone should wear some kind of mask.
New reports also find it is showing up in some cats, dogs, and tigers. It has less of an effect on them so far. While it is considered not likely, they can spread it to humans (the dead-end theory), this is not fully known at this time. Some folks have pointed out it seems easier for a pet to get a test at a vet, than the human since testing is so limited at least in the US.