Perhaps this will not be a proper long essay, but I thought of something today.
The Death Eaters are kind of masochistic when it comes to their sycophancy, aren't they? They bow and scrape to Voldermort after a session of torture under the Cruitis Curse over the slightest transgression. They say "yes master" and do whatever the Dark Lord demands sacrificing their free will and autonomy in exchange for what? Tormented the hated Muggles and "mudbloods"? To have Voldermort smile at them in his cold snake-like way, hissing, "good job?"
How is that any different from the House Elves who sacrifice their sleep, their comfort to serve their masters. Who shuffle and scrape and torture themselves at the whim of rich wizards who can end their servitude just by handing them a sock in their size?
What do they gain from this arrangement other than housework, cooking, endless tasks involving dusting, scrubbing and mopping the floors of huge houses that are nothing but floors and bricks? Their masters can kick them around anytime they're in a bad mood. Anytime a meal gets burned, a curtain falls, a doxy nest is found an elf can be abused, thrown from the room and somehow they just love it!
Crouch fires his House Elf for no reason other than her own fear and she still defends him constantly like a battered woman claiming her husband was just drunk, that it was her fault. Kreacher would be beatened or would have to slap himself around or even be decapitated as a House Elf of Draco and his ilk, but he longs to be with them anyway.
Bellatrix wants sons to sacrifice for the cause of the Dark Lord. Various Death Eaters have twitched in pain under the wand of Voldermort, from Avery to Wormtail, and yet they run back to him like puppies wagging their tails wanting a treat, wanting to kill more Muggles, to grab a prophecy they don't even understand just to please him. They don't know what his mission is, they aren't aware of the fact that Voldermort doesn't love them, doesn't consider them his friends, and if he wanted more Horcruxes, he'd kill them in five seconds without thinking about it. (He shows signs of the disorder RAD in its most extreme form)
Then you have Dumbledore to consider. Kind, compassionate, gives people a second chance. It makes perfect sense to follow him.
If you make a mistake, he forgives you. His kindness towards his followers makes them want to follow him. Lupin and Harry have felt the guilt of disobeying him, he doesn't even have to raise his voice because his love and loyalty makes a person want to obey, to trust in him even when he does things that make no sense to them such as trusting Snape and not buying into the prejudices that most of his people believe in.
And yet Voldermort and his ilk despise him and everything he represents the way House Elves hate freedom, the idea of having no masters to serve and making their own decisions.
They find his compassionate ways an anathema to their thirst for power and domination. He represents the peace they want to destroy. In a second he would have forgiven any of them, even as Malfoy tried to kill him, he still showed him compassion and understanding, even Malfoy's father who despises him.
Dumbledore represents freedom the way it should be, the wizarding world the way it should be, free of prejudice, free of judgement and hatred with each person judged on their potential, no one being a slave to another person.
Someone remarked that Dumbledore is a slave owner. This isn't the case. Dumbledore understands the evil of trying to force your will on another person for the most part. He understands the nature of most House Elves and that many of them without servitude would die.
He gave people choices and chances. Not like Voldermort who would kill a Death Eater if he wanted to leave.
Dumbledore knew that people have to make their own decisions and find their paths for themselves whether it's Harry or Snape making the decision to spy for the Order, if he is good.
But, there were instances where he was overprotective and believed he alone had the right path and ideas, as we see in book 5 which is filled with depressing mistakes and their consequences. It was then that he strayed into that territory of trying to protect people so much, you took away their will.
But, despite his mistakes his goals are so much better than that of Voldermort.
Prehaps I should rewrite this essay later to make it clearer. I haven't written an essay in ages