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

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.