Great questions!

Regarding the second one, "What would [people] think if they knew exactly what I was doing?" - I absolutely agree that it's important as a pragmatic issue. If someone will get upset by a technique - justified or not - we need to factor that into the decision to use it.

But do you think their discomfort is a sign that the technique is unethical in any meaningful sense, or merely socially frowned upon? Society tends to form its conventions for a reason, but those reasons aren't necessarily tied to a consistent conception of morality.

That said, I agree that if people get upset by a practice, it's a good warning sign that the practice could be unethical and merits careful thought. ...Which could be exactly what you meant by asking the question.

By the way, I'm looking forward to meeting you at Skepticon next month - I'll be moderating a panel you'll be on!