Hundreds of thousands of demonstrators have churned out across the US on the weekend to support the March for Our Lives movement demanding action on gun control and that US politicians begin standing up to the National Rifle Association. That movement is spearheaded by student survivors of mass shootings, particularly those who attended the Parkland, Florida high school where a gunman killed at least 17 people in February, and the NRA hasn't been quiet about how it feels about all this.