The best way to enslave a people without them knowing it is to dumb them down and then brainwash them. That may sound like a line out of the popular series “The Boys,” but it’s not. “All democracies fail because people are f—ing stupid,” Sister Sage, a superhero in the series, said. These days, reality is a lot more interesting — and sinister — than a television show. In reality, progressive school unions are actively trying to dumb down students in order to indoctrinate them. The Chicago Teachers Union and its progressive allies recently geared up for an event designed to get students to …