Legitimately question: Is that even possible if Snowden hasn't been charged with all of the crimes he could have been charged with? What I mean is that Obama's pardon power doesn't pardon an action, but rather specific violations of the law that prosecutors have brought against him. So what would stop people prosecuting him anyway even if he was pardoned but for other similar offenses?

Do you really think he could come back to the US without living in fear? Even if Obama pardons him officially, there may be many unhappy americans with weapons at home, who don't like what Snowden has done.

But an official pardon would allow him to settle everywhere, for example in Europe. That would certainly be helpful.