but there are lots of other awful groups doing awful stuff around the globe 24/7 that impact UK and US interests but don't prompt severe military retaliation
Name one that is blocking a major transport lane by firing missles at ships. We took action when a US Navy ship was attacked by 24 Houthi drones. You don't attack US ships in international waters and not expect blowback. To parapharse Godfather, it's not political, it's business.