On hysterics and circus at parliamentary committees

To my mind, anyone, be it a government official or a mischievous child, screaming and otherwise actively and inappropriately drawing attention at a parliamentary committee is a strange and undesirable event. But to have three Tory ministers come to a parliamentary committee (to which they were not invited on that particular day) and start a childish show of arrogance and disrespect for others - that's not really describable through regular English. Is growing up at some point in time at least a vague plan for the current federal leadership?