5. Foreign wizards
Throughout the whole series, we are constantly reminded of an existence of a large international community of wizards all over the world. Triwizard tournament features wizardry schools from France and Scandinavia, Charlie Weasley goes to Romania to study dragons, Victor Crum is from Bulgaria etc. Yet when Lord Voldemort attacks Hogwarts, none of the foreign wizards comes to the aid of one of the most famous schools of witchcraft and wizardry. It is as if the Dark Lord is a minor issue concerning British wizards only. Not even the famous International Confederation of Wizards, a UN-like organization of wizards and witches, does anything. Why is that? This has always bothered me, which is why it is number 5 on the list of 11 magical plot holes in Harry Potter.
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