Mispronunciation has complex causes, often far back in history In Britain, for instance, ruling groups impose their language, and but for the 100 Years War we'd all be speaking French now. Somewhere way back, as far as we can make out, a very small group of German mercenaries managed to impose themselves as an aristocracy on the vastly larger British population of the eastern provinces, but it was quite easy to turn yourself into one of them if you learned their language, with the result that as compared with any other dialect of German English has about thirty specific features, all of them typical of 'Celtic' British. The one thing you must NEVER do however was understand your own language: you had to pretend that was impossibly difficult, with the result that 'English' people can't possibly pronounce 'Welsh' names, or learn simple rules like that in the latter language 'f' is pronounced as in English 'of', 'ff' as in English 'off'. You become part of the power-group everywhere by playing these silly games, especially with names, and it is almost unbelievably boring!