> Governments have a legitimate need for secrecy in some situations. If FBI investigations of white collar crimes were posted on a public website, for example, there would be a dramatic rise in both flights and wire transfers to Belize.

I think this argument is based on a strawman. The 'secrecy' most people assume and that the government wants is 'keeping secrets indefinitely at their sole discretion'. The 'secrecy' needed by your or any other scenario is merely a time-limited secret, ie. that all information must be released publicly once investigations are completed. The former is intrinsically harmful, the latter shouldn't harm anyone.