You don't need to shatter
all of their mind...
"See, John, this is how you seamlessly repair a '
pleasure centre', and shift... inconvenient memories into a warm, rosy, glow..."
('centre', not 'center', because this is
England, after all!)
May the limbo-dancing shoggoths, with the hula hoops and lei garlands, only ask politely before replacing the dodgy looking sheep, you count to get to sleep at night.
("Lovecraft was an amateur, we've got E.E. (Doc) Smith, and A.E. van Vogt!"

)
((van Vogt invented the Coerl, in '
Black Destroyer', Smith the Edorians in the '
Lensman/Triplanetary'... Science fiction authors have created things that would eat the Cthulhu Mythos for breakfast, and not even burp...

))
(((Don't believe me? Consider what the term 'full armed, dirigible multiverse' might mean.

)))