I especially like this idea. In order to "save" humanity the Archons start kidnapping people to cast Sanctify the Wicked on. Since the spell takes a full year to complete, these people will be missing for a long period of time and when they come back they will be changed, perhaps with golden eyes to reflect the spell. Go with a whole "Invasion of the Body Snatchers" vibe and you could really have some fun with it.
You now have superhuman beings that want to make everyone "just like them." Also, as being more intelligent and wiser, clearly they see the benefit greater than you do so for your own good they must do it against your will.