Are people really so dense that they need to be told what is dangerous?
Don't answer that…
These new servers I got here at work (Dell PowerEdge 1950 III), of which there are 34, are festooned with warning stickers: Don't stick your fingers in the fans, don't monkey with the internals with the power on, don't lick the power supply… Well, okay, that last one isn't on there, but they do warn you that there is voltage in the power supply…
It reminds me of a question on a HAM radio test: “You should stick your hand into an energized transmitter: (a) Sometimes, (b) Always, (c) Never.”
But it is even more pervasive than this. On a package of CDs next to my desk there's a sticker that states “Warning: This product contains chemicals which are known by the state of California to cause cancer in laboratory tests.”
So, only California knows this eh? And they have a warning sticker for something that *might* happen – if you eat an entire spindle of CDs. Of course California is a special place to begin with and I'm sure they spend ridiculous amounts of money on warning stickers there.
Then again, I've always espoused that they should remove all of the warning labels on everything and let the problem solve itself – but I'm also a crass asshole.