This became a "right" thing when the Democratic Party--or more succinctly, the people they put on the ballots in liberal cities--have moved so hard to the left that they are unrecognizable to normal classically liberal Americans like myself. When these folks are running in the general election, they say all the right things to keep the votes from normal traditional Democrats who appear to have no idea who they're actually voting for. Once they're in, they go completely radical and do so relentlessly. Some of these DAs appear to be the worst, most evil, least-caring public officials I've ever observed in my life.