Question

if the children's crusade did not take place, what would be the motivation behind such a strange tale? (Need the answer as soon as possible!)

Answer 1

He was a pied piper, that is someone who induces others to follow or imitate him or her, especially by means of false or extravagant promises.

So that is why he would say such a strange tail.

Answer 2

Answer:

Facts and mythical events were merged to give more beauty to the tale of the children's crusade with the intention of covering the what it really was: A failed and unfeasible "attempt" of taking back Jerusalen.

Explanation:

After later revisions of the children's crusade conducted by moderm historians,  they found out there were many fictional events to cover the fact that crusade was unfeasible from the very beginning and only resulted in  the death of many followers, starvation of many others and the sold of many children and older followers as slaves when they sailed supposedly to Holy Land when they where sent to slave markets instead. All of that was preffered to be covered with the tales of devoted children who decided to march to Holy Land doing miracles on their way. All of this to cover the truth of that mistake.