Always.
Think about the bad habits people create. Did I chamber a round? Am I carrying today without a round? Do I rack the slide when I draw?
Honestly, if a person does have to draw the last thing they need to worry about is if they have a round in the chamber.
Im trying.
Its just that in his day and age, shock value gathers more attention than articulate prose.
Here's my situation... My favorite carry is my M&P9c. I have 3 kids (4 and under) that I take care of daily. With my M&P on my hip, there are frequent times when my kids will give me a hug or bump into me, and my gun is pointing right at them. Considering the M&P's firing pin is 95% cocked before pulling the trigger, I believe that the M&P could light up a round in case of a mechanical part failure.
Would you hold a chambered M&P (or glock) up to your head and allow someone to whack it with a hammer or fist?