The problem is I have heard a few calls called wrong. So to take action like that really is a last resort, because when you do it, by God will there be some answering for it, and if the flight recorder shows you were wrong, you are out of a job! But agreed, sometimes it may be an absolute last resort. The great reluctance to do it is probably the copilots know if they do, and an accident is averted......no incident, Far Eastern face saving time.....'you are fired!'