Lol no, guns don't just magically go off when in a holster. Yes mechanical failures do happen, but it requires very specific types of impact in very specific ways that cannot happen when in a holster and are so rare as to happen on decade timescales with tens of thousands of the gun. Also I saw zero evidence of that guys gun going off in the video, the first shot heard is the shot coming out of the ICE goon's gun that he is pointing at that guy, who then also mag dumps him while he is on the ground.