Many many pilots and a lot of instructors do not know how to salvage one.
You are basing this definitive statement on what exactly?
I can tell you that here in Australia, where I have trained and examined dozens of flight instructors, all of them were trained in bounced landings. I had to play student and try various ways of messing up the landing and they had to recover. The catch was I had to also be able to recover if they messed up the recovery. That gave me a great deal of respect for the design of training singles.