Heavy metal icons Gwar staged a mock beheading of Elon Musk and murdered President Trump during their performance at this weekend’s Riot Fest, with critics slamming the band for “normalizing violence.” Shocking video shows the chainsaw-wielding Musk mannequin, dressed in sunglasses, a baseball cap, a black “D.O.G.E.” t-shirt, matching black jeans and a jacket being decapitated by a member of the band mid-show at the Chicago rock festival. To cheers from the crowd, the mannequin’s head comes flying off with a slice of the costumed band member’s sword, sending a jet of fake blood spurting into the air. Gwar —...