We also have the right to attack Afghanistan if we can provide evidence that an attack on our country came from there. I suspect we will do so shortly even if we cannot offer proof.
International law is never going to be enforced but on a selective and cynical basis by mankind in any event. It will take Christ's millennial reign to have "peace and justice" upon the earth.
So what? They are still hypocrites. They had no regard for killing non combatants, let them not give speeches or put conditions on us. As to international law, it is not worth the ink it is written in. We need to do what we have to.