I'd add for the "school in English/dominant spoken language" part (because compared to the other it doesn't seem that bad) in a quite a few cases it stems from a previous active effort to suppress a culture that was never really 'fixed', not simply just "eh I don't understand so why do I have to cater for it?".

If you're European, chances are you can name a good few examples that happened in your borders, both as something you did or something that was used against you