Sen. Christopher Murphy, D-Conn., speaks with a group of anti gun violence activists and gun violence survivors in Washington, Feb. 12, 2025. As the administration works to expand gun rights, hospitals and community groups have lost funding, and reports on preventing firearm injuries have vanished from government websites. (Haiyun Jiang/The New York Times) By SHERYL GAY STOLBERG The Trump administration has gutted federal gun violence prevention efforts since returning to office, slashing…