In regards of Gibraltar, the problem is it being a fiscal paradise. If one of the agreement was that Gibraltar has too have the same rules as the rest of the EU it could be enough for the Spanish government.
And if that meant enforcing the same for Ireland and Luxemburg, even better.
In the books, the role of the Atreides family was not to be the good guy but the necessary evil to reach the final step of saving humanity. Even Paul can't stand his own role in the story.
Except the Zionists have been working to conquer the place since the 19th century. They even wanted an arrangement with the Nazis to settle in Judea... but not for the Jews that were poor. Only the rich ones.