''Discipline'' the child when parents are there ?

[Inspired by Reggio]

... Now why can't parents understand how to take the control from the child like we do?

Because we parent out of the investment and necessity of maintaining harmony and safety in our group and IMO many parents today parent out of GUILT so they do not want what little time they have with their child being marred by correcting behavior ... little do they realize if they invested in that time when wee their time would be more 'positive' over all specially as they grow up and behaviors like that 'escalate' when left undisciplined!