The politics of being an oppressed class with a class of oppressors isn’t new, and there are a lot of opportunities for white women to act in fucked up ways (eg Karens), and for people to treat white women in fucked up ways. She was probably chosen to be specifically humiliated and brutalized because of Missing White Woman Syndrome, and it’s playing out as they expected - which will embolden them to do it again.
Attributing our concern to her whiteness racializes and politicizes her humiliation but it’s still a disgusting humiliation and brutalization.
By citing the MWWS without context, the implication is that we should be ashamed for our concern, as though we only care because she’s white - a statement that is, for me anyway, and I think for more and more people these days, false - but it’s irrelevant - MWWS is a phenomenon, but she was a person. Her treatment was disgusting and trying to undermine legitimate shock and disgust is cruel.
While MWWS and the politics of white femininity are important (and specifically caused this woman’s uniquely horrific treatment), it doesn’t help to discuss them in the aftermath of specific horrors, and trying to shame people for feeling disgusted by disgusting behavior is, well, it’s why you’re being downvoted. The point of equality isn’t to treat privileged people worse, it’s to treat underprivileged people better.