The hieroglyphics on most electronics is a very visible result of the complexities of a global economy with strong consumer protections. Some explanations here: http://www.apartmenttherapy.com/deciphering-the-power-label-on-your-ac-adapters-168405
I would venture to guess that most people would be just as happy without them plastered on all their stuff, but they do probably provide a vague sense of legitimacy. Perhaps they are even interpreted as stamps of quality, much like the East India Trading Company's symbol: "It served as both a guarantee of quality and to ward off thieves and pirates." - http://pirates.wikia.com/wiki/East_India_Trading_Company