I guess that the gist of what I am trying to say boils down to "Giving advice".

For instance, If I learned to fly with a taildragger, even though it wasn't recommended, I would say:

"It may not be advisable, but I learned how to fly with a taildragger, and didn't really have a problem"

Translation:

"I did it, but that doesn't mean anyone can... You might be an idiot"

That's good advice.

Bad advice is:

"Go ahead and do it."

Because, Who knows? Maybe he really IS an idiot!