By using Twitter as a communications channel for official announcements, they are at least legitimizing it.
If they have any reason to be concerned about the security of their account (and it looks like they should have at least from now on), they should arguably reconsider their choice of platform.
For people who are victims of identity theft, of course not, but for organizations or governments? Yes, clearly yes. Let's make sure that the burden of securing operations generally stays with, you know, the folks that have staff and budgets.
If they have any reason to be concerned about the security of their account (and it looks like they should have at least from now on), they should arguably reconsider their choice of platform.