Because you can!

The Holy Father, in his encyclical Gravissimum Educationis, instructs us, "The role of parents in education is of such importance that it is almost impossible to provide an adequate substitute."  The new Catechism of the Catholic Church further exhorts us, "The right and duty of parents to educate their children are primordial and inalienable.  Parents have the first responsibility for the education of their children." (#2221-2222)