I don’t think that’s it. Mentioning the Missing White Woman Syndrome in this context implies that we should not feel disgust or concern because we’re only feeling that way because she’s white.
The point of MWWS isn’t that we should care less about white women, it’s that we should care more about non-white women; it would be more apt trip being it up in the context of the brutalization and humiliation of a non white women about whom no one seems to give a shit.
As I’ve said in a few posts on this thread: the point of equality isn’t to treat privileged people worse, it’s to treat underprivileged people better.