Re: [WHY ARE WE HERE]
Not necessarily, they don't. Maybe you didn't know, but they're fighting among themselves, now. If we're discrete, and if we do it in a place where they can't see what we're up to, why would it even occur to them that it was us?
As far as they know, we don't have the information to do it, the ability to keep hidden, or the final piece. We didn't have access to that judge's realm; he was long gone. They've been underestimating us since the day we woke up. We're food to them.
On the other hand, powerful beings with open infighting seem to be on the verge of declaring a war of their own. Mirror just happened to pick the wrong side... that's all.