"Do not be afraid" even if the certainties of the old order have been overthrown.
"Do not be afraid" even though you no longer know what you can count on, what you can rely on, what you can base your plans and prospects on.
"Do not be afraid" even though, with death no longer ultimate, you surely cannot look to the civic order to give you peace and security.
Now the only security is in Jesus himself.
It seems to me that the Resurrection has overthrown the certainties of the old order in a peculiar fashion. They still compose a viable system, of a sort. You can still live your life as though death were the end, and according to whatever principles and morals you choose.
Easter leaves that more or less intact. What it does is give us another choice. It says, "Or you can choose what's behind Door Number Two," which isn't a door but a large stone that has been rolled away, and what's behind it are Jesus' burial cloths, and the cloth that had covered His head, not with the burial cloths but rolled up in a separate place.
Death and taxes are still certain, but the sting of the former has been removed by another, new certainty, set along side the old ones but not really comparable to them.