"... and please, don't give general advice..."
"why not?"
"The problem with the general advice is that everybody knows about it. You've assumed that people don't follow it because they are stupid. Instead, you should have assumed that they don't follow it because they know something that you don't, but simply don't tell you about it. That's why when you give a general advice one looks either stupid or like a hypocrite. More importantly, don't give advice if no one asked you for it "