I'm fairly sure most wouldn't consider that ethical, either, but in that case it's likely more because they insist on continuing to see the undead as people. They focus on who they were and who they might have been, as opposed to the notion that the person themselves is long dead.
[...Usually. That is usually the case and we're not going to get into the subject of the mutated ones, or the fucked up ones like Lisa Trevor screaming for her mom and what have you.]
And I simply mean that objectively, there's not much we can get out of them. We know how to destroy them, and that they can't be cured once infected; we know what they're used for and what mutations are likely to present themselves. All things that can be gained through observation. Keeping them is more likely to just have them break themselves somehow, or to end up with them wandering around infecting people. Or trying very hard to infect people and just walking into walls until someone sets them on fire, I suppose.
no subject
[...Usually. That is usually the case and we're not going to get into the subject of the mutated ones, or the fucked up ones like Lisa Trevor screaming for her mom and what have you.]
And I simply mean that objectively, there's not much we can get out of them. We know how to destroy them, and that they can't be cured once infected; we know what they're used for and what mutations are likely to present themselves. All things that can be gained through observation. Keeping them is more likely to just have them break themselves somehow, or to end up with them wandering around infecting people. Or trying very hard to infect people and just walking into walls until someone sets them on fire, I suppose.