[user104658]

Originally Posted by Alf

It can apparently escape a secure high security lab, but a thin piece of cloth is gonna stop it.

Crazy, absolute crazy.

I seriously believe some of these people would chop of their leg if they were told it will keep them safe.

It doesn't completely "stop" it, it reduces the likelihood of transmission and therefore slows the rate of spread, which is a good thing even if it's only by a small amount.

It's really not very hard to understand, unless you misunderstand the purpose of them and pretend that you think they're supposed to "definitely keep you safe".