How Lavabit Melted Down
The more I read the more sympathy I have for the government here. They had a (presumably lawfully obtained) warrant against a specific user; it's not they who designed lavabit such that it was impossible to execute this without obtaining access to every other user. The proposal that Levison would extract the information himself rather than turning over the keys strikes me as completely unrealistic - any information so obtained would be quite rightly thrown out of court, because there's no reliable evidentiary chain, only (in effect) Levison's word. Even if he had turned over the SSL keys, the US still has a fairly strong "fruit of the poison tree" doctrine: any information the government happened to obtain on other users would be invalid for prosecution because it wouldn't be covered by their search warrant.