Many rational people shudder at what passed for critical discourse in the 2016 U.S. elections. In this timely 2^nd Edition of Why We Argue (and How We Should): A Guide to Political Disagreement in an Age of Unreason, Scott Aikin and Robert Talisse double-down on their call for the necessity of proper argumentation, for one's own cognitive health and for the health of democracy. The lively style that ran through the 1st Edition is retained in the 2nd, with examples drawn from Trump, Clinton, their spokespeople, and other candidates. Other updates to the 2nd Edition include an augmented chapter on online discourse, a new chapter on televised debate, expanded "For Further Thought" sections, and a more robust companion website.