Re: and things like chargers tend to have plastic prongs with metal tops.
" Although the standard US mains plug is pretty shitty with fairly thin prongs, I'm sure it's not beyond the wit of man to come up with a safer design that's partially insulated to avoid this problem without having to invent a new wall socket."
True - but for the federal government to mandate the use of such an improved plug would be unconstitutional interference in the people's right to freely express their stupidity by taking an extension lead to bed with them. Once started down this slippery slope some of them will then be wanting affordable health care for all and a limit to how many arms a bear can have.