Families of the Robb Elementary School shooting victims filed lawsuits against Instagram, the publisher of "Call of Duty," and a gun manufacturer, alleging they contributed to the training and equipping of the teenage gunman. The suits focus on the companies' role in "grooming" the shooter and are among the first to target a video game maker for promoting weapons used in mass shootings. The lawsuits also attempt to link social media companies to mass shootings, claiming they facilitated the promotion of firearms. The legal actions face challenges due to federal laws protecting online platforms and gun makers. The suits argue that the companies' marketing and content influenced the shooter's actions, leading to the tragic attack.