As for the Snowden extradition actually being a human-rights issue that's another story. I get that what he did was probably morally right but it was still illegal. I'm not sure why everyone is so shocked (SHOCKED, I say!) at the US wanting to prosecute him.
That said, the US would be smart to just forget about the whole thing. The damage has been done and this continued talk about prosecution for Snowden is making him a martyr.