In my observation, children are less easily fooled than adults. They respond to what is genuine, and do not rationalize away things they find "inconvenient," as many adults do. Yes, the Holy Father has charisma "in spades": the charism of Christ. Your comparison of John Paul II to Hitler, ultima ratio, is gratuitous and tendentious. IMHO. FWIW.
Before you accuse this holy man of being some kind of dangerous pied piper cynically misleading the innocents, it might be useful for you to read some of his books. You could start with Crossing the Threshold of Hope. As for the "carry through" of the Holy Father's message in the lives of these young people: Operations in the spirit are not things that you or I can directly observe. But in a world gone mad, people -- perhaps especially young people -- hunger for the sanity of eternal truths. Which you will find articulated in the referenced work, provided you have the eyes to see, the ears to hear. May the grace of God be with you.