When law chooses to put emergency situations before itself and its regulatory force and effect on the government and authorities, it relies on human moral goodness, of police and other officials, who are in fact mostly immoral, self-centered, abusive, and uncaring, and if not are in herd mentality forced to be so.
The law safeguards operations by a system of immediate accountability, in fact it is pre-situational accountability.
Emergency activities rely on one thing: human goodness, and that is quite frail when it can trump an entire body of constitutional rights.