It's important to be able to speak English because English language is one of the most widely spoken in the world. If you travel abroad the chances are, many people in that country can speak English so you will have no trouble communicating. Also, there are a lot of great American and British movies and tv series that are way more interesting to watch in the original language.
Nowadays, English is a worldwide language, so we need it to communicate with whole world. Also, there are a lot of amazing books, TV shows, movies i English and it's the reason to learn English and read , watch original versions. Also, English is a good way to find new friends