Not only do Americans often mispronounce, misuse and misspell their own language, but they also speak in slang terms that butcher the mother tongue. None of this is a problem considering the development of America as separate from England until Americans complain about "foreigners" not speaking English properly without even a trace of irony.
Using English to speak is not evading the use of our mother tongue. The English language is very fast becoming the world standard language for all countries, and is not being used to evade our mother tongue. It is simply language and communication evolving just like it has in the past.