User blog comment:PitaKang/FANFIC! :D Muggles vs Wizards!!!!/@comment-3218619-20120824201515/@comment-1630894-20120824222726

Your hypothesis that wizarding families are limited to one children is flawed. Not only are there numerous examples of wizard families with multiple children (the Weasleys, the Blacks (Both Sirius and Regulus and Bellatrix, Andromeda and Narcissa), the Dumbledores, the Greengrasses, Harry and Hermione and Ron's future families, and others) but your examples of single children, one isn't even a wizard family (Hermione, and even then JK Rowling said she originally planned to give Hermione a younger sibling but never managed to find a good point to introduce him/her until it was too late). Harry's parents were killed when he was one, and Dean's father left after he was born.

You make a good proposition about greater anti-muggle sentiment among wizards. However, you ignore the fact that the anti-magic sentiment among muggles is going to be tremendous due to the extra confusion and hysteria. No official government science group saying "Oh yeah, we discovered that all modern science is wrong and magic is real" is going to be able to calm them down at all.

Dementors are an interesting question, as it has never been confirmed if anything can harm them other than the patronus. Wizards have never used any other combatative spell against them, so that could suggest that they are resilient to physical harm, or just resistant to other magic. However, the Muggles aren't going to assume when it randomly gets cold and then some guy just collapses into vegetative state that it is some invisible creature behind it, they aren't going to have a clue what's going on. Peope don't just go around wearing heat vision, because invisible enemies aren't the sort of thing that are anticipated.

The current wizard population estimates are based on Hogwarts' size, with other wizarding schools the ratio will be less in favor of the muggles (though still heavily Muggle-dominated). I don't really see how Muggles can create any form of technology capable of dealing with magic, it can't really be scientifically analyzed.