Cause this will not benefit her in any shape, way or form.
Ofcourse she's allowed to speak her mind but for a globally known celebrity sometimes it's just better to keep opinions like these private and 'politically correct'.
There's no reason for her to get involved in unneeded mess.
Just days ago she was the most talked about celeb at the World Cup, became hated by the entire country of Argentina, and is now inserting herself in Middle Eastern political conflicts.