Why not protect against Kilgrave's powers in other ways?
In Jessica Jones we discover how Kilgrave's powers really work: It is a virus.
Then why does Jessica not use some kind of helmet or even a whole suit like the CDC ones to avoid being controlled by him?
It seems much easier than creating a vaccine that could not work.
Best Answer
As seen in the show and described in her wikipedia.
She possesses superhuman strength, as well as flight, and is known to block mind control because of her strength.
She is already able to block mind control, so there is no point for her to wear a suit.
Also Killgrave (The purple man) controls other people to do bad things to themselves, and he uses that to manipulate Jessica. As said in the comments, it wouldn't be too easy to make the whole world to wear suits...
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