There is something that always bothers me with Childrens accounts of anything, the potential that they have been frauded for a more devious and darker purpose. For instance it's noted that in certain cultures there are cult groups that attempt to get hold of young children to carry out sacrificial practices, and obviously to lure them away they might use all manner of methods. Perhaps even their practice might require wearing certain ceremonial face masks.
The other concern is the relevent Paedophilia rings that exist in the world, and how they could inflitrate government "classified" systems and use them for their own dark practices. Afterall when I was a kid I was told never to talk to strangers, the question is does a child relate a stranger to Aliens, Clowns or other potential masks that someone might use to get them to come away quietly.
Another point is, if you see someone walking away with an Alien, you call it a UFO abduction not a Child abduction for any of the portraid acts above and where does the questioning start on a missing persons report if all the witnesses suggest they saw an alien.
