Some amount of Grim is to be expected, since the source of the powers make its host extremely volatile, and agressive (Not helped by the fact that it favor Traumatized teenager), I suspect that anyone not under Arturia direct order will have trouble staying out of battle, just look at most place beside the USA, where Cauldron set up a game of cop and robber to vent the urges, some collapsed into Warlordism, others saw country taken over, and others yet simply conscripted all people with power and let them duck it out between themselves in order to canalise them.
As far as I am concerned, getting a handle on the UK is the first priority, and it will be a Challenge in and of itself.
Not to say we won’t be able to lend a hand, but the situation went quite FUBAR in a lot of place in the original timeline.