"These would be kids who are too young to enter into a legal contract. Sorry, the responsibility for the laptops remains with the last legally responsible entity who had them"
So given that rationale and returning to my previous scenario of a neighbor borrowing something, you'd be perfectly content if the neighbor never returned said item or conveniently lost it since you never had a legal contract between the two of you explaining the terms of the loan?
I'm not arguing from a LEGAL standpoint. I'm arguing from a responsibility stand point. There are plenty of situations where someone cannot be LEGALLY held responsible for something, but that doesn't make it right or something that should be swept under the rug.