Put it this way - on the other hand, there are many sensitive questions that can be inflected by an underlying need to gain approval, avoid disapproval, or their own compliance to appear "good" to the interviewer at the moment.

If it's a political topic, where someone can get lost in the herd so to speak, they can be partisan/intellectualize as a way to mask themselves as an individual. It's cheap and easy. Are we learning about them, or seeing their environment has them scared straight?

I guess with the parental question, there's a motivation to not be candid on that either though. What if the person feels they'd be selfish complaining about their parents or be ridiculed for expressing themselves? If it's a sensitive question, that involves vulnerability of not having feelings validated. If you're hurt by something, and someone scorns you for simply for stating discomfort, that's a pretty difficult situation!

Hm - what would be a valuable question to gather insight on someone, that's open ended, but not invasive? Would there be a way to phrase it so there wouldn't be pressure to give a "good" answer / portray an ideal self-image?