[judofyr]

> If I'm teaching an introductory class on Chemistry, you'd better believe that when I reach the section on cyanide I'm going to tell students: "bad, bad, bad; never use this chemical"!

I agree. So would I. However, what Zed is doing in the last chapter is showing code written by other people. If you taught your students about an experiment done by other (widely regarded) researches, would you say "bad, bad, bad; they should never have used these chemicals"?

I would say: "See, they used it here, but only because they were very, very, very careful. Let's explore different ways this breaks down. … As you can see, I'd recommend you to not do what these people did."