> >+ve tip. You can guess what happened. Sure, ultimately his fault
> >but for the sake of a 1c diode........
> 
> So I should burden my product design, for a few million devices,
> to prevent someone from having an accident when they plug in my
> power pack to a different device that it wasn't designed for?

No, I was alluding to what you said here -

"On pretty much anything I've designed, the wall wart will be as 
simple as possible, and the smarts will be in the product"

If the product had a 1c blocking diode, not the wall wart

An SMT diode is probably 0.1c, if that, but working back
through all the mark-ups, it's still around 1/50,000th (in my
estimation) of the production cost. Hardly over-engineering

I won't be hypocritical - accidents do happen, through inattention
or ignorance (eg my customer who used a 12V charger instead of
a 12V battery - my boards have a blocking diode but a virtually
AC supply is just too brutal) and I have killed my own circuits.
Although I routinely add a diode to everything now. In some cases,
when the customer has to supply their own wall wart, a full bridge

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