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Imagine if Colorado spoke one language, Arizona spoke another, Texas spoke their own, Florida had their own, etc. If America was like that, I guarantee the average American would know at least 2 languages. 
This is basically how Europe is.
As an American who is only fluent in one language, I don't blame people for not being multilingual. But I do blame people who get weirdly mad about other languages existing. >

My wife had a coworker who would get mad if people near her weren't speaking English. And this was at a business that had more native Korean speakers than native English speakers >

In the middle of Hungary people get upset if someone don't speak hungarian. And complain barely audible that everyone should speak hungarian who dare to come to this country. lol