IIRC correctly in the anime, the "destroy the world" part happens twice, I don't recall how it's solved the first one (is it the event when Kyon travles to the past? I forget). But the second one happens during the "present" in the anime, which is solved by Kyon "sacrificing" himself to become her boyfriend. Anyway when I say "destroy the world" I mean she noticing the pattern that she can make her problems dissapear if she wants it enough. Maybe I forget, but I remember parts of the anime revolving around everyone playing along and at the same time trying to change her mind so she doesn't cause disasters. It's enforced also by the fact that all the main characters aren't regular people, except for Kyon. And each one comes from a different faction who want to steer her in a different direction. Then again it's never explained at which age she starts being monitored/steered, or if she had the power from the beginning, only when the first big disaster caused by her happens for the first time.