When you’re used to fast food and junk food as your steady diet, and try to make better health choices in diet and exercise, your body feels miserable for a while, so you tend to give up too soon. The same can be said of economic policies. When we have bad economic policies we get used to them, and it can be hard to correct them at first. But the alternative is economic death if no corrective measures are taken. Trump is trying to correct decades of bad economy habits both sides have promoted: the pain is only temporary.