It's long but after reading this ask why you would believe this man who, in this new article, is making plenty of assertions all based on quotes from a single anonymous source.
https://www.vox.com/2015/5/11/8584473/seymour-hersh-osama-bi...
If someone had an inside source on deep background with evidence of an American cover-up? Hell yes they would. And if they wouldn't, the Journal would pay a premium.