"If a student was upset, then it was a bad idea."
No. It was a bad idea, but not for that reason.
If students' being upset were the index of bad ideas, students would never leave their comfort zones, and hence never learn anything.
It was a bad idea because the purpose of schooling is so to strengthen students' imaginative and reasoning capacities so that they become able to create inwardly what they would otherwise have to experience outwardly. Conscience and compassion arise from being able invisibly - that is, without physical props - freely to transpose oneself into another's place.
Experiencing the undesirability of being tied up is not learning; a beagle can (and must) respond to that. To invoke a figure familiar in these parts, that's training rather than education.
To gain valuable experiences through mentally and emotionally participating in a verbal description, a narrative, a drama - offered by a teacher who has gained the trust of pupils by her moral standing and demonstrated empathy - that's education, which can subsequently be abstracted and implemented at will, by choice, through the students' volition. That's what constitutes specifically human learning. It takes a little longer, but the effects endure.
I know she meant well, but the teacher ought to be horsewhipped.
Oops, what did I say...? :oops: