Why can't people from countries third world countries like Africa and the middle East that come over to the Western country speak proper English?

Not intending to promote racism I don't condone it but when i am working on the job with people who have come from countries like that it feels like there is a language barrier and they seem to speak broken English or like English is not the first language and it creates a lot of problems but even if it is hard to understand it makes the job a lot harder to get done. Why can't people just speak proper English
Why can't people from countries third world countries like Africa and the middle East that come over to the Western country speak proper English?
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