If he's so educated why couldn't he pass an analyst test and have to work as a SharePoint admin? Why did he think PRISM was some all-consuming surveillance system, when the documents so clearly stated it wasn't? Why did he think Hong Kong would grant him asylum for leaking Chinese targets? Why couldn't he pass high school? Why is he a libertarian?
I've known many people like that who can convince laypeople that they're smart, but everybody in the field (software engineers at Internet companies in Snowden's case) immediately sees how stupid they are. Look at flat Earthers and antivaxxers for contemporary examples.
https://slate.com/news-and-politics/2016/09/what-snowden-get...