This depends to some extent on what you believe about the Children's Crusade. Because this event was not an "official" crusade, blessed by the Pope, there are not really any solid records about it. No one knows, for example, what ultimately happened to the children who set off for the Holy Land.
If you believe that the children set off for the Holy Land and then died in a storm or were captured and sold into slavery, then the shame of this crusade is clear. It is shameful because Christian Europe allowed all these children to be blinded by religious fervor and head off on a totally impossible quest, only to be killed or enslaved.
If you do not believe that this happened to the children, it is less of a shame. However, it is still (one can argue) shameful that the children were allowed to get so carried away as to go off from France or Germany to Italy and, potentially, put themselves in danger. Either way, it does not speak well for how much the people cared about their children.
I think the real shame is in the concept that religion is everything. The idea that 30,000 children under the age of 12 were released and blessed by their parents to follow God's will is insane and it shows how twisted the idea of religion is and just how far any society is willing to take it.