You Have to Experience It
steve.vinoski.net
steve.vinoski.net
You don't have to be a heroin addict to make a compelling case against its use.
A great collorary to this is chapter 14 of Huckleberry Finn. I forgot how many times the n-word was in there, however.
Once they know something well, or are happy with what they know and the decision they have come to for themselves, they do not feel the need to talk about it?