[Ask Cortana about galaxy-spanning doomsday cults and how much she adores them.]

Stopping a bunch of violent religious fanatics cold is a public service in its own right, but I do wonder to what degree they're a sideshow rather than the main attraction. If you're an unknowable cosmic evil bent on destroying reality and you've got a bunch of loud nutcases already busy trying to blow up the universe, you might as well use them as a distraction while you go about your business.

[What if they have two potential Judgement Days to worry about? Cortana is such an optimist.]