In past messages, I've gone round and round with PZ about the pros of wall warts (AC adapters). We all agree that I'm right. They are safe on many levels, both because of component design and construction, and because of the physics of the universe. So there.
Beyond that, some corrections:
Doctors and hospitals are not "protected".
By themselves, UL/CSA compliance rules have no legal standing. Governments and companies can have policies requiring that items purchased with their money, or regulated by their agencies, comply with UL rules, but that's not the same as, for example, a law against robbery.
Comparing a wall wart to a revolver is...inaccurate. The odds in Russian Roulette are about 1 in 25 for a well-maintained six-cylinder revolver. No, it isn't 1 in 6, because gravity has a pronounced effect on where the cylinder stops rotating. For a wall wart, the odds of *any* failure is about one in 1 billion. For a lethal failure it is closer to 1 in 10 billion. If these numbers seem large, they aren't. The world consumes about 3 billion wall warts per year, and the little bastards just don't die. Now that the industry is changing to miniature switching power supplies in these things, the odds can only get ***better***.