The line from the Obamas was “When they go low, we go high.” It’s a dignified and impressive mantra, if only because for the most part, whether you liked them or not, it’s hard to deny that they followed it. But the now cliché remark should not be taken conclusively, for it makes one dangerous omission. It forgets that from time to time in life, we might have to take someone out behind the woodshed.