My understanding of Palantir is it does things like, kinda boring CRUD/CRM type things, but for law enforcement. Like, the police got the warrant and data for mobile phone location, Palantir will plot it for you, provide some pretty basic analytics, but ultimately it integrates lots of different data types into something easy to read.
Is that so bad? I mean, again, I don't live in the US, but this, if I got it right, is exactly the kind of thing I'd hope the police do use. And if this is misused, that's very much a problem with the police, not the software. You shouldn't fix police excess by only providing them with insufficient tools. Just as you don't fix police brutality by taking away their guns and giving them water pistols instead.
But maybe I got it all wrong, happy to be corrected.