It is not reasonable to ask any American to participate in violating the Constitutional rights of other US citizens.
The case is fairly simple. (1) The US can listen to the communications of foreign enemies whether they're talking to US citizens or not. This is allowed by law. (2) The US cannot collect/listen to communications (any variety) of US citizens. This is not allowed by law (or constitution), and there is good reason to believe it has been taking place.
The 2nd is what Snowden revealed and is what makes him a whistleblower instead of a spy/traitor.
And it's also why listening to any email used by Snowden is not acceptable. If it's in contact with foreign enemies, then go ahead and listen. If not, then there's no reason for it.
The secret courts and secret warrants and legal muzzles are also problematic.