TL; DR :
how is this legal? ... Why is he allowed to do this?
Porque o Arthur Weasley escreveu a lei . E a brecha. Apenas para beneficiar o seu hobby.
Detalhes:
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O raciocínio legal é o seguinte:
Você tem que lembrar que todo o ponto de mais das leis relacionadas a trouxas é o mesmo: impedir que os trouxas aprendam sobre o mundo dos bruxos.
O uso indevido de Artefatos Trouxas provavelmente é o mesmo, já que parece haver um ponto absolutamente zero para proibir enfeitiçar objetos "Trouxas" se nenhum Muggle os encontrar - afinal, muitos, se não a maioria“It’s all to do with bewitching things that are Muggle-made, you know, in case they end up back in a Muggle shop or house. Like, last year, some old witch died and her tea set was sold to an antiques shop. This Muggle woman bought it, took it home, and tried to serve her friends tea in it. It was a nightmare — Dad was working overtime for weeks.” (Chamber of Secrets)
Como tal, de fato, enfeitiçar Ford Andlia a voar e nunca voar (não ter Trouxas descobrir um carro voador e enviar Agente J para investigar) cumpriria o ponto da lei e, portanto, é possivelmente uma "brecha" para tem.
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E ... o raciocínio real é claro, como observado pela Sra. Weasley, é:
“Yes, Arthur, cars,” said Mrs. Weasley, her eyes flashing. “Imagine a wizard buying a rusty old car and telling his wife all he wanted to do with it was take it apart to see how it worked, while really he was enchanting it to make it fly.” Mr. Weasley blinked.
“Well, dear, I think you’ll find that he would be quite within the law to do that, even if — er — he maybe would have done better to, um, tell his wife the truth… There’s a loophole in the law, you’ll find… As long as he wasn’t intending to fly the car, the fact that the car could fly wouldn’t —”
“Arthur Weasley, you made sure there was a loophole when you wrote that law!” shouted Mrs. Weasley. “Just so you could carry on tinkering with all that Muggle rubbish in your shed! And for your information, Harry arrived this morning in the car you weren’t intending to fly!” -
Dito isso, você pode ver que isso é apenas racionalização, e na verdade a brecha de Arthur Weasley provavelmente seria considerada "inconstitucional" (se de fato houvesse uma revisão judicial das leis no universo de Harry Potter) - porque se os Weasleys morrem, Como observado na citação acima, existe o risco de que o Flying Ford Anglia - ou outros itens - acabem sendo vistos pelos trouxas. Ou, se for o caso, se alguém (* tosse * Ron * tosse *) rouba isso para um joyride.
Fred laughed. “Yeah, Dad’s crazy about everything to do with Muggles; our shed’s full of Muggle stuff. He takes it apart, puts spells on it, and puts it back together again. If he raided our house he’d have to put himself under arrest. It drives Mum mad.”
... e a Sra. Weasley parece concordar:
“You could have died, you could have been seen, you could have lost your father his job — ”