The current leading plan is to establish that we are involved in this and to ask for their side of the story, only escalating if they won't talk to us. I don't understand what blame you're talking about here.
Seconded. Even my tweaked plan is basically Usagi all but begging for the Ainos' side of the story so we can meet in the middle, find common ground, and come to an understanding (And yes, I'm channeling my inner Mojo-jojo for that last part). It only calls for any kind of hard stance as a last resort—and if we have to go loud as Sailor Moon, for
any reason, the conversation is well and truly FUBAR and we're beyond trying to resolve this peacefully—aka, the nuclear/M.A.D. option.
I'm tempted to just hint that Minako was kidnapped as a part of a Dark Whatever plot, but was recently rescued
I may just be acting overly paranoid, but I definitely prefer having a cop on hand, rather than being a middle schooler all on her own. Even if we're likely better off alone
if things get S.H.O.C.K.E.R.y, I feel that having a cop might prevent something wacky happening entirely.
I do, however, like the idea of saying Minako was caught up in a DK plot. I don't know exactly how I'd word it, but I'd want to tell the truth while leaving the opening there for the Ainos' to think "she was kidnapped" rather than "she ran away to fight demons."
Something like... She got involved in a DK plot that saw her end up on the other side of the world, and it's only been recently that the British government got everything handled, thus leaving Minako free to come home.
Which is all true, but highly misguiding.