There's no need to go into that interview guns-blazing. Soft-balling the questions at first is likely to do the job. If it doesn't, they can still bring in the heavy artillery later.

This approach has worked very well for me in all kinds of adverse situations. Being nice and asking politely has resolved a lot of situations, and I can still fall back to being nasty if I have to. (And I might even find I was wrong before that point, and I can back off without losing face.)

For instance, returning a defective product at a store. I can simply tell them it doesn't seem to work. They can attempt to show me it does, they could take it back, or they could refuse. If they try it and it doesn't work, and still refuse (or just refuse), I can start demanding my money back. If they refuse that, I can call corporate or my credit card company.

If I start with corporate or my CC, I might still get what I want, but it's a lot more stressful and IMO less likely to work, even if only slightly. And there's no chance to fix the situation with another resolution than the one I chose. Sometimes there's a better way, and you just don't know.