Sometimes a too-quiet child suggests something not-too-good is going on for them. Not wary perhaps; more so concerned, worried
We should be 'wary' for all children. Some rebels can live in reaction. Some compliant children can lack the ability to take an independent stand. Some compliant children will have discord inside that will express itself in passive aggressive actions. Thoughtful values, independence of thought and the inner conviction and esteem to be able to make a stand - can be nurtured and present in compliant children. Compliant until you step over a line.
As long as they're not mine , I don't care. ;)
Why should we be?