The world Isn't split into good people and Death Eaters

The rescue

As I arrived at privet drive a screech owl swooped in through the window. Narrowly missing the tip of uncle Vernon's head, it soared across the kitchen, dropped the large parchment envelope it was carrying in its beak at Harry's feet, turned gracefully, then zoomed outside again.

"Owls!" Bellowed uncle Vernon as he slammed the kitchen window shut "Owls again! I will not have anymore owls in my house!"

But Harry was already ripping open the envelope and pulled out the letter inside, I made my way over, attempting to read over his shoulder, but the letter spoke in a clear voice, almost like a howler.

"Dear Mr Potter,
We have receive intelligence that you performed the
Patronus charm at twenty-three minutes past nine this
evening in a muggle-inhabited area and in the presence
of a muggle.
The severity of this breach of the Decree for the
Reasonable restriction of underage sorcery has resulted
in a hearing within the ministry, questioning your expulsion from Hogwarts School of Witchcraft and
Wizardry.
Hoping you are well,
Yours sincerely,
Mafalda Hopkirk"

"Why might you been expelled?" Vernon glared at Harry.

"Because I did magic"

"Aha!" Roared uncle Vernon, slamming his fist onto the table "so you admit it! What did you do to Dudley?"

"Nothing"said Harry, slightly less calmly "that wasn't me-"

"Was" muttered Dudley unexpectedly "All went dark. Everything dark. And then I h-heard... Things inside my head"

Uncle Vernon and aunt petunia exchanged looks of pure horror "how come you fell over, son?"

"T-tripped" said Dudley shakily "and then-"

He gestured to his massive chest. I understood. Dudley was remembering the clammy cold that filled the lungs as hope and happiness were sucked out of you.

"Horrible" croaked Dudley "cold. Really cold"

"Ok" said uncle Vernon, in a voice of forced calm "what happened then Dudders?"

"Felt... Felt... Felt... As if... As if..."

"As if you'd never be happy again" I entered the conversation tonelessly.

"Yes" Dudley whispered still trembling.

"So!" Said uncle Vernon, voice restored to full and considerable volume as he straightened up. "You put some crackpot spell on my son so he'd hear voices and believe he was- was doomed to misery or something, did you?"

"How many times do I have to tell you?" Harry began to shout "it wasn't me! It was a couple of dementors!"

"A couple of what?"

"Dementors" said Harry slowly "two of them"

"And what the ruddy hell are dementors?"

"They guard the wizard prison, Azkaban" I entered the conversation once more.

"I heard- that awful boy - telling her about them- years ago" aunt petunia spoke randomly.

"If you mean our mum and dad, why don't you use their names?" I said loudly, but aunt petunia ignored me. She seemed horribly flustered.