You didn't read carefully. Hindenberg's statement specifically mentioned military as well as economic use of neutral countries. If you don't think that included the direct risk of the US entering the war on Britain's side, then you've already forgotten about the Zimmerman memo that you yourself posted to this thread.
So I accurately represented Hindenburg's strategic point of view on the matter... and your problem with that is what?
You've really got no argument anymore. And of course, we musn't forget that the reason we started down this road was because of Germany's predacious submarine tactics. Are you seriously suggesting that freedom of the seas in such circumstances is a matter for insurance companies?