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The expelled half-giant. The young werewolf. The repentant Death Eater.

He protects them and gives them a second chance. All he asks in return is their loyalty.

And, if on occasion he requests that they undertake a certain task, invoking their debt of gratitude - well, that is no more than he is owed.

He once thought to add a certain disowned Black to his collection, but quickly realised his mistake.

Sirius is not an outcast, but a rebel. He knowingly chose his path, and chooses what price he is willing to pay for it. He refuses to be used.

Harry was an outcast due to a childhood filled with abuse and neglect. 

Vernon made him an outcast by dismissing his claims of magic, berating him, locking him in a CLOSET and putting bars on his window, and let’s face it, even though her editor made her cut it out, Jo intended for there to be physical abuse. 

Petunia made him an outcast by enabling and contributing to this abuse, as well as making Harry do dozens of chores while doting on Dudley. 

Dudley made him an outcast by bullying him and threatening any students at school who wanted to be his friends. 

And the rest of the wizarding world made him an outcast when they bullied him for being an outsider.

Harry James Potter became an outcast the moment he was placed with The Dursleys.

Think about it What would Harry have been like if he had grown up in the wizarding world? Or, to put it another way, what would Harry have been like if he had grown up in a world where magic was the norm?

He would have taken magic for granted. He would have been less likely (especially as he got older) to view Dumbledore as a wise mentor and more likely to see him as flawed and capable of bad decisions. He would have seen both the world and Dumbledore as ordinary, with their good points and bad points.

But Dumbledore didn’t need a well-adjusted boy who took magic and the magical world for granted. He needed a child who would love the magical world unstintingly, even irrationally, because it was a haven from neglect and abuse. Even more, he needed a child who feared this world becoming evil and who therefore would not question someone that he saw as the ultimate authority, especially if he believed that obeying that authority would keep the world safe.

Even if obedience meant his own death.

Dumbledore wanted a martyr who would die for the wizarding world, because he believed that Voldemort could not die until Harry did. Which was why he left Harry with the Dursleys and let them neglect and emotionally abuse him for the next ten years.