They have to create an emergency because they know the only time they'll get what they want - yet more money siphoned upstream to the wealthy away from the poor and middle class - is to say there's an emergency and "we have to do extreme things in extreme circumstances." They don't care about democracy. They know people will vote against it, so they look for ways to avoid democracy (I'm looking at you Rick Snyder) and push through whatever they want however they can.
The best defence is to not fall for their lies. Just don't buy it.