Sure we know where they are. Here's an example by quick search:You can't "bomb the hell out of them" if you don't know where they are. You seem to think they're a proper state based in one place with an evil lair that we can break into and steal their plans for world domination, but this is guerrilla warfare with moving targets who hide behind children when they get found. Also how exactly do you believe bombing a random middle eastern country will stop people born and raised in the country of attack from doing anything?
And to your random country point, I think that bombing would stop those that want to radicalize from doing so because they would have little support. Destroy the source.