They legit believe Harry Potter can somehow take and utterly destroy Modern Humanity despite J.K. Rowling and even Fantastic Beasts 2 explicitly states and shows that WW2 Era weapons and otherwise can wipe the floor with them, let alone modern tech.
It's like SB fails to realize one of the biggest failures of the Wizarding World next to it's arrogance is how little they know or care about Humanities' advancements nor have anything to actually deal with it.
EDIT: It's like they look at what Scrimgeour did in Deathly Hallows/Half-Blood Prince and think "Duh, All Wizards would be able to instantly tell where every Military Complex is and can instantly apparate and destroy shit despite Harry was going to be killed Mid-Apparate by a THROWN KNIFE if it wasn't for Dobby, let alone fucking bullets" rather than Wizards would rightfully not even know what a GUN is outside of it being "A Metal Wand", let alone a fucking Fighter Plane, Missiles and Nukes.