If you see the president's job as defending and legitimizing the concept of "Holy warrior" - and then claiming ISIS aren't - what is it? I see NO reason or authority for the President to legitimize "Holy Islamic warrior" in ANY context.
"Crusader" has many positive meanings too, doesn't it? Crusading for justice, for civil rights, and, historically, to fight invading Muslim armies. The President had no problem using that word as a generic evil, did he?