The advantages gained by say a French speaker learning English are huge. An English speaker learning French, or even Mandarin? Really not so much. This attitude of "those Europeans are so much more intelligent than us, look at all the languages they know" really needs to die. They know English because they need it and it gives them an advantage. Or often just because they want to watch popular TV shows.
BTW English is the most commonly language spoken in Europe as well. The days of Europeans learning the languages of their neighbours is largely over; Norwegians and Swedes, Germans and Dutchmen are much more likely to converse in English than to know each others languages. In your hypothetical scenario, the person would have almost certainly tried the national language first, then English.