The analogy is imperfect: Nineteenth-century Irish potato farmers thought the famine was temporary and therefore underreacted (continuing to plant as before), while 1980s American manufacturing workers thought the widening wage gap was temporary and therefore overreacted. In both cases, inappropriate reactions magnified the effects of the initial surprise.
One moral is that it's better not to make mistakes than to make mistakes. But of course we already knew that. The deeper moral is that one particular kind of mistake—a confusion between what is temporary and what is permanent—can explain a lot of human history.