User blog comment:Real Godisme/Fairy Tail 100 Years Quest Chapter 3/@comment-7418318-20180801185845

That caps-locked question is also something I immediately thought.

If they don't get involved in anything, why do they need to be sealed? And if they can cause cataclysms, why would you want to risk agitating them?

If not even the actication of Face, Zeref's invasion, Acnologia's assault or the use of Universe One made them act, then what in the world could possibly cause them to go into action? ...other than self-defense against and unprovoked attack of course...