User blog comment:IamJakuhoRaikoben/Chapter 463: Black Carpet, Review./@comment-124.82.58.141-20151123163941/@comment-7418318-20151123174436

Not really.

Lumen Histoire is just one of Alvarez' goals, but not the sole reason for the invasion.

They do want to conquer the entire continent as far as they know and ultimately Zeref wants to wipe out all of mankind (but I doubt he told his troops that).

But even if exposing Lumen Histoire were to be the only way to gain allies, wouldn't that still be preferable to letting everyone in Fairy Tail die along with the many people who just were unlucky enough to be in Alvarez line of attack, like the people living in Hargeon or Bosco?