I have always found it a disgrace that appliance connectors (like on the back of most PC's and laptop power bricks) are the same, no matter what input voltage they are made for.
Plus around the world are all different, a US plug isn't made for 220, and a European plug isn't made for 110, but on the back of the box they are all the same, it's just asking for trouble.
It would be no more than $4 in parts to built some kind of protection into them to prevent stuff from blowing up, and Apple is absolutely not alone in this.