Education is like torture. Or, the opposite of torture, in the way popular culture regards it.
We are all proud to hear that the United States does not torture, but we do not have a sound, common definition of what constitutes torture. Torture is vague, something that evil people do. Take waterboarding. Some say it is obviously cruel, while others point out that we do it to our own as a routine part of training. We go on to ignore the lack of definition and argue about whether this vague idea is effective, and under which hypotheticals it might be exceptionally permissible.