Didn't Child Emperor fuck up the hero association here?

The hero association is under attack, they are lacking defenses and need urgent help, but the child emperor went and deactivated the hero association's defenses on top of that and in the end that wasn't even one of Bofoi's cards.

He simply went and deactivated the hero association's defenses at the moment they were most needed, when they are already under attack and apparently in need of urgent reinforcements for no reason, he just fucked the association over for good leaving them completely defenseless in this situation.