Pardoning Snowden would be a powerful way for the president to acknowledge that the government did wrong, kept us in the dark, acted unconstitutionally. And but for the actions of Edward Snowden, we would still be in a very dark place.
You have to recognise your responsibility to your community for your actions. Liberty doesn't mean that you are not held accountable. Without accountability, there can be no freedom. I know it seems like a paradox.