Of course real life is not like this -- but it's not that bad either. You could say the same thing about anything -- why teach kids play basketball, as it might create false illusion that they will master it after few games? Why teach kids art, as their drawings will be crap judged by adult artist standards? Why teach kids anything?

The educational programs serve the purpose of accustoming kids to challenges that await them in real life, and I believe that the prepared ones will be served with the less severe blow.