In a different election year, a place like Milwaukee’s Zeidler Union Square would surely have been teeming with people, marching around with Sharpied signs and chanting about fascism. Instead, the square, an official protest zone located a few blocks from the Republican National Convention, was like a scene from some postapocalyptic tale. This afternoon’s designated protest zone was a wide, mostly empty expanse of lush grass. In the middle stood a charming gazebo equipped with a microphone and sound system. But nobody appeared to be speaking. Orange-shirted security staff paced…