It was originally developed by many nations sharing the data. So, it can't probably be kept as much in secret as F22 anyway, this is why it is available for exp

It was originally developed by many nations sharing the data. So, it can't probably be kept as much in secret as F22 anyway, this is why it is available for export. It also fills a completely different role. U.S. has such an overwhelming air superiority in any potential combat theater from Somalia to Moscow that they shouldn't be worried about someone having a better plane to bomb then.