Think about getting a flu shot. The nurse comes in with a tray that has a sterile cloth on it, with the syringe with sterile cap, alcohol wipes and a bandaid. Yet does the nurse wash up before putting on gloves? Did they wash before preparing the tray? Simple law of sterility teaches that once something non-sterile touches a sterile surface the entire object is contaminated.
With diseased patients collecting in hospitals, it is impossible to sterilize them and the environment. Why don’t you propose putting the entire operation in an autoclave, along with all the patients before they are allowed in.