Cost, risk, and mostly need. Terrorist organizations tend to not have advanced fighter jets to shoot down. And why bomb and expose your expensive ass F-22 that is designed for air superiority, when you have a perfectly capable A-10 that carries more munitions, is cheaper to operate, and comes with a side dish of BRRRTTT.
I remember seeing them fly over my house in Golden Colorado in the mid--70s there was probably a airshow somewhere close but it was cool where I was my family that have served have always been air force but I've always been partial to the blue angels because of that day
