Learning would be exceedingly laborious, not to mention hazardous, if people had to rely solely on the effects of their own actions to inform them what to do.
The bottom line is that the human body is complex and subtle, and oversimplifying - as common sense sometimes impels us to do - can be hazardous to your health.
In the sequence where I am burned at the stake, everything was so casual and hazardous that the bottom of my dress caught fire, and the grips became hysterical as they tried to pull me off the stake.
New legislation has just been adopted by the International Labour Organization on the Worst Forms of Child Labor, such as bonded labour, prostitution and hazardous work.
Accosting somebody in public can be regrettable. Accosting a gangster can be hazardous.
I don't walk around looking into cameras and telling people I'm the best fighter in the world just to hear myself talk. I say it for the same reason they put warnings on packages of cigarettes, and fighting Chael Sonnen may be hazardous to one's health.
Drinking water that does not meet a federal health guideline will not necessarily make someone ill. Many contaminants are hazardous only if consumed for years. And some researchers argue that even toxic chemicals, when consumed at extremely low doses over long periods, pose few risks.
I feel badly for the people who suffer from the side effects and consequences of hazardous pharmaceuticals. It's antithetical to the Hippocratic oath.