Many native English speakers do not learn to speak other languages well. Should they? Why? What are

I think a native English speaker doesn\'t need to learn English because many non-native English speakers usually communicate with them in English. I know one American who has been in Koren for over ten years but is still clumsy in speaking Korean. That\'s because he hasn\'t felt needed to learn Korean to communicate with others around him. However, it must benefit him to learn another language, such as a better understanding of Korea, Korean people, and Korean culture. Likewise, we need language skills to know about some countries and many things about them. Therefore, for native English speakers, whether they learn another language or not is up to them, however, they can get more things by learning other languages.