Not sure why you're getting downvoted. It is completely expected to lose aircraft in an operation of this scale, against an opponent with this level of sophistication. People put way too much stock in all of these modern stealth systems and whatnot. Stealth, for example, is a buzzword. It will give a slight edge, but it's not going to make your aircraft completely invisible and unshootable.

The Iran war is going exactly to plan and this isn’t a bad day for the US administration?