For many children, school is the obvious place to learn another language. However, there are so many other important subjects such as mathematics or history that not pupils have enough time to study everything.
One argument for making language lessons compulsory is that a child’s future profession may need language skills. Another reason is that learning a language introduces you to other cultures and helps your understanding of other people. Thirdly, some people believe that it helps young children become more intelligent.
On the other hand we also have to remember that not everyone will have an “international job” so language learning might never be useful to them. In addition to that, there are many other subjects such as geography which also provide knowledge of the world. Finally, some people believe that it may be good for children to learn another language too early in life.
So, on balance, I believe that learning another language at school is important for a child and will give them an advantage later in life as well as being more enjoyable than many other subjects.