WASHINGTON — There’s a lot of talk in Washington these days about whether that quaint politeness known as “civility” is possible — or even desirable — among the nation’s political combatants.Lots of Americans got riled up over Justice Brett M. Kavanaugh’s confirmation hearings. Party leaders are busy branding opponents as “mobs” gone mad, and worse.Then there is President Donald Trump, an innovator in the field of talking smack, trying to energize his supporters …