What Snowden leaked is not known, especially since the reputable news organizations were asked to be careful about what was reported.
You're assuming that the government doesn't also have access to what he's given to news organizations, which is a very bad assumption. You might not know, but the government knows, and they have actually stated that no one has died because of his leaks. Everything he has leaked to the public was already known by our enemies, only our own citizens didn't know. Now, everyone knows.