I don't think anyone could persuade Musashi,Kojiro-kun and Nyarth that joining Rocket-Gang wrong,they've been doing it too long to honestly care what anyone tells them especially the main protaginst Satoshi/Ash..he doesn't like when they attempt to steal certain Pokemon,and he tells them to stop,but don't listen to that either,so what's so different about this,I doubt they would listen to Satoshi-kun,because they never do to begin with..and besides wasn't it out of their own will to stay a part with Rocket-gang for so long..so if they were to quit or realize it's wrong,it would have to be themselves,no one else but themselves.

The above comment is very true.