First of all, I'm of the opinion that certain things are always bad, but the good that they can bring can outweigh the negative. For example, killing is always bad, however, there may be situations where not killing someone is worse because of some other factor. Like, suppose, protecting your children. A possible example, letting someone kill your children when you have the power to stop them is worse than killing someone. The act of murder becomes no less bad, but the circumstances surrounding it make the "good" option.
Secondly, we need to distinguish what sort of mind control we're talking about first. Is this taking the reins of someone's mind for a time, or is it changing their mind for the greater good? The latter I consider one of the most horrible things that you can do to someone, it strikes at someone fundamentally as a being with agency. This becomes a different situation if it's consensual, but I don't think that's the primary case being discussed.
Assuming the taking the reins version, I think it depends strongly on what you make someone do. If someone's about to kill someone and you stop them, that's a very different deal than if you made someone kill someone else for the greater good. One is analogous to physically restraining someone, while the other is compelling someone to do something they might not want to. I think both are still bad, and worse than mere physical restraint, but the second is much worse.
Assuming the mind warping version, this is where I think it's almost impossible to do something ethical with. The notion that someone could tailor your thoughts to their liking is absolutely terrifying. You'd have no means of knowing what of your thoughts and opinions were consensual and which were imposed on you. There's an episode of Buffy the Vampire Slayer that touches on this, although it was with removing memories instead. Character A changed the memories of character B to make them forget that they'd ever had a fight. A and B were romantically involved. It's an invasion of a part of your life in which you're most guaranteed privacy and it robs you of your agency or ability to rely at all on your own experiences. I can't think of anything that would make me more certain to break up with someone.
Uh... that was a bit of a detour. In the mind warping version, it'd either have to be consensual (in which it's fine), your changes would have to be incredibly minor, or it would have to be necessary to prevent something absolutely catastrophic.
Secondly, we need to distinguish what sort of mind control we're talking about first. Is this taking the reins of someone's mind for a time, or is it changing their mind for the greater good? The latter I consider one of the most horrible things that you can do to someone, it strikes at someone fundamentally as a being with agency. This becomes a different situation if it's consensual, but I don't think that's the primary case being discussed.
Assuming the taking the reins version, I think it depends strongly on what you make someone do. If someone's about to kill someone and you stop them, that's a very different deal than if you made someone kill someone else for the greater good. One is analogous to physically restraining someone, while the other is compelling someone to do something they might not want to. I think both are still bad, and worse than mere physical restraint, but the second is much worse.
Assuming the mind warping version, this is where I think it's almost impossible to do something ethical with. The notion that someone could tailor your thoughts to their liking is absolutely terrifying. You'd have no means of knowing what of your thoughts and opinions were consensual and which were imposed on you. There's an episode of Buffy the Vampire Slayer that touches on this, although it was with removing memories instead. Character A changed the memories of character B to make them forget that they'd ever had a fight. A and B were romantically involved. It's an invasion of a part of your life in which you're most guaranteed privacy and it robs you of your agency or ability to rely at all on your own experiences. I can't think of anything that would make me more certain to break up with someone.
Uh... that was a bit of a detour. In the mind warping version, it'd either have to be consensual (in which it's fine), your changes would have to be incredibly minor, or it would have to be necessary to prevent something absolutely catastrophic.