Nope, that's kinda toxic. Yeah, you can be 'protective' and you can have the desire to do what Jae In is doing, but if you let it become real actions (she's literally blackmailing Sora), then it's toxic as fuck, and also an asshole move. We can't blame anyone for having certain feelings, because most of the time we don't have control over it, but our actions are all our own responsability.
Jae In is acting like those parents that tell their children they can't do anything besides studying, because 'it's for your own good' or 'You can't waste time for insignificant things like friendships'. She's imposing her own beliefs and opinions over Sora, as if she had the right to do it. Not everyone would do this, and if they do, then it'd be just as toxic and criticizable.
don't lie, you all would be as protective as jae-in if you were in love with or admired someone. it's not like she's telling sora to kill her in her sleep or anything