Not knowing that you're going to piss people off by deliberately manipulating rumours and information to gain power at the expense of others is entirely on him. "Could have used that knowledge earlier" my ass. It's not about knowledge. It's about common sense and morals. Get some of those instead.
"What if that messenger was fake?"
How to spot the one who's got something to lose by her being real.
This feels like when the Watcher showed up to confirm that it was, indeed, the real Thanos that Squirrel Girl beat. Just have the holiest of holy women show up and proclaim that the messenger is, indeed, real.
"What could they even do?"
Her wrath is not to be dismissed. She doesn't care about your laws.
And then the
other one shows up. They're more fucked than all of the girls.