The Dark Side Of Usability

That's a decent objection if the goal is to teach thought process, danger avoidance, or moral behavior where internalization is the intention.

That said, it also behooves people to try to make some things more universally safe.

For example, I was in Ottawa, Canada a few years ago. They have a lock to go between rivers in the middle of their city, being on the junction between rivers. This concrete structure is in the middle of town with walking trails around it, and features a 5-10 meter drop to water with no guardrail or edge around it.

To my American eyes, this looked quite dangerous as an inexpensive preventative measure could be added to prevent what could be a common accident. On the flipside, not having a guardrail would cause people who were aware of it to become more aware, and general raise their level of awareness, along the lines of this article.