Ignoring your false dichotomy, it should be fairly obvious what some of the negative consequences of such an analysis of a large corpus of social data could provide for the US government, a totalitarian state with a long history of infiltrating and manipulating social movements.

I'm also a realist and understand that this kind of analysis is inevitable and will eventually be continuous. I'm not arguing that it shouldn't be done.

If you were a realist you would review the definition of totalitarian.

Here you go: https://en.wikipedia.org/wiki/Inverted_totalitarianism