I don't think there's anything that would convince that sharing passwords is ever an acceptable means to an end. Don't share passwords is sacred.
If the government has a interest in not having employee Twitter accounts that it doesn't have control over, off the top of my head, it has a couple legitimate, and more practical options:
1. Convince/pay/legislate Twitter to create a role-based interface where accounts can be designated as administrators to other accounts, and then require government employees to have an official government account as their administrator account.
2. Prohibit government employees from having Twitter accounts.
And the government already has a legitimate avenue to obtain control of Twitter accounts in case of national security or w/e - they get a warrant and fax it to Twitter. (Or maybe they just call up a pre-established contact at Twitter without any oversight.)
If the government has a interest in not having employee Twitter accounts that it doesn't have control over, off the top of my head, it has a couple legitimate, and more practical options:
1. Convince/pay/legislate Twitter to create a role-based interface where accounts can be designated as administrators to other accounts, and then require government employees to have an official government account as their administrator account.
2. Prohibit government employees from having Twitter accounts.
And the government already has a legitimate avenue to obtain control of Twitter accounts in case of national security or w/e - they get a warrant and fax it to Twitter. (Or maybe they just call up a pre-established contact at Twitter without any oversight.)