it’s possible you associate the expression of sadness or anger with shame and seek to “protect” a child from shame by trying to prevent them from expressing these feelings. When there are other kids around, this urge might be stronger than when it’s just the two of you. Maybe you fear that the other children will be confused or scared when one child expresses big emotions. Or perhaps you learned that it’s polite to mind your own business and not to burden anyone with your own concerns.