"With no World Court legitimacy"
You are either ill informed or you choose to be. We have nearly ever country on earth on our side in this. Even old enemies like Russia. They may not be in lock step with our actions, but they do support our right to bring the perps to justice. What more of a world court do you need.
And, if you think that they are not already against US forever-- then you must be blind. They have been against US since 1967 at least. This will not change until we show our resolve to answer agression with swift and resolute power.
You can make fun of the President all you want, but on this one, he is right. We must stand up or many more people will surely die!