Hmmm...sounds as if you are seeing some potential problems, and they're not being open minded enough to shift gears to honestly look at the issues you're concerned with. I've had that problem at work myself but tried to change my approach a bit to be less negative and make it sound more like I wanted things to be as good as possible by suggesting some additional things they could think about...If they ignore my suggestions, it's kind of their problem, not mine, right?