Why aren't Catholic priests married?

                              Why Do Catholics Do That?
                               Celibacy, "the renunciation of marriage implicitly or explicitly made, for the more perfect observance of chasity," (Catholic Encyclopedia) allows a priest to focus on his calling without the practical concerns of family life.
                                The goal of a celibate life is enhancement of love; a way for priests to "consecrate themselves with undivided heart to the Lord and to 'the affairs of the Lord' (1 Cor 7:32), they give themselves entirely to God and to men"  (CCC 1579).

                                 Note : there are some circumstances under which married priests are permitted.  There are several hundred serving in the United States.