Harry Potter. What the hell.

     We all know about Arthur Weasly's obsession with Muggle stuff, and how he's considered 'a bit of a nutter' by his own family, let alone other wizards. The problem with this is you CAN'T just live in an exclusive wizard society, even in the eighties and nineties, when the books are set.
     They use cars, so there needs to be a basic understanding of things like gas, batteries (a particular peculiarity of Arthur's), traffic laws, and just how to drive. All things used exclusively by Muggles, according to the books.
     I understand they have their own hospitals, but the Muggle government has NO record of any Wizarding child's birth? They can't track their school records? What about Muggleborns? Do they just vanish off the rolls at age eleven?
     What about vaccinations? Is that not as big of a thing in the UK as it is here? We saw what Molly thinks of Muggle doctors. They don't need casts for broken bones or stitches, okay. Can they magic away cancer? Heart disease? The need for new organs? What about brain damage? Or blunt force trauma? Do they have magic solutions for that too? What about getting shot? It could be an accident, easily. Can they magic out a bullet? Fix all the damage with a wave of the wand?
     There has to be more to the 'we have a witch/wizard in our family, but we just can't talk about it.' Are Muggle family members who know magicked so they can't talk? Are there secret cults who know about the wizards but instead of just hating them, actively seek to kill them, like skinheads? What about support groups for siblings who didn't inherit magic ability? Or squibs for that matter. I understand they can't do wand magic, but what about potions? Or care of magical creatures? Are there government liasons between Muggle and magic besides the 'Hey we exist' call the PM gets? There must be, what with all the apparently empty/doctored by magic personal records flying around.
     I know there are about a billion unanswered questions in the Harry Potter universe. These have just been nagging at me a lot lately. Love to hear your thoughts!