In-Q-Tel as an investor doesn't mean much, IMO. It does mean the product is of interest / value to the government, but that doesn't imply any sinister motive (or a ton of control). I work for a company that was invested in by In-Q-Tel, and the only influence I've seen from that was really to benefit the users in the community and develop a project for RBAC in Big Data - which is something I really hope the NSA has in place internally.

edit: and I'm a Libertarian, so I'm biased against reaching this conclusion based on my own observations.

NSA as a customer was taken from both companies having a product called prism. Not very strong evidence.

I have some firsthand experience with this overseas. Palantir creates intelligence products for the US military and other government organizations such as the "State Department"...