"America or not" is a red herring. Palantir is the specific problem.

The kind of people running these companies don't have true allegiance to anything but their own objectives. If necessary, they'd move all operations to Europe or East Asia in a month, and you'd have "Palantir 2" under a different name with no better ethics or privacy.

Increased emphasis has to be on running things domestically with on-premises hardware. As long as the vendor is elsewhere and not subject to oversight, the risks remain.