An inquiry found the murders of three young girls at a Taylor Swift-themed dance class in the U.K. in 2024 “could have been and should have been prevented” after repeated warnings about the attacker. Now, serious questions are being raised about whether the U.K.’s counter-extremism program can stop a new kind of threat: young people driven not by ideology, but by a fixation on violence. CBS News' @inayafolariniman reports. #southport