The IRA do not attack U.S. targets -- but they train terrorists who do. Even if they didn't train other terrorists, the IRA, like ETA, Hamas, Osama bin Laden, etc, is evil.
The IRA is the easiest target: search every house in Northern Ireland and the vicinity; take every ounce of cemtex, every gun. And let the British and Irish governments do this together. And get the unionist terrorists while we're at it.
As for the Taliban: use Russia's help and invade, or invade via Pakistan (give Pakistan no choice). Hunt down these fuckers.
The ETA, Hamas, Hezbollah, ... -- all of them must be destroyed.
And warn the Colombian guerrillas and paramilitaries that their next if they don't cool it.