If you think that Snowden is a hero, start a petition to put up a statue of him in Fort Greene Park. The Prison Ship Martyrs Monument wasn't just put there by some guy on a whim. It was a decision made by government at all levels as the result of a process that is public and open to all citizens.

Is Snowden a hero? Maybe, I dunno. Ask your fellow citizens if they want to put a statue of him in the park. That's how democracy is supposed to work. It isn't perfect, in fact it's the worst form of a government. Except for all the others.