SETH BARRON is the The Post’s Associate Editorial Page Editor, and the author of “The Last Days of New York” and the new book “Weaponized: The Left’s Capture and Destruction of America’s Sacred Institutions ” (Humanix Books, out now) . In the adapted excerpt below, he writes about weaponization and the current political landscape. We have heard a lot about “weaponization” over the last few years. On social media, it has become a kind of shorthand, like the word “gaslighting,” for anything that someone finds annoying or unscrupulous. For instance, it is common among relationship counselors or observers of the dynamics between men and women to talk about “weaponized incompetence.” This phrase usually refers to men pretending not to understand how to handle young children or the complexities of meal prep to get out of doing housework. Men have used their alleged inability to do things as a defensive weapon in their war with women.…