I should have known, LDH, that you were posing this as a rhetorical question. Just for fun, this is how the WTBTS states it's mission for the public face:
http://www.jw-media.org/beliefs/index.htm
And another:
http://www.watchtower.org/library/jt/index.htm?article=article_04.htm
By the way, this organization pads it's mission worst than most. Most organizations have their mission statement front-and-centre, as is expected in an open and honest society.
Here is their stated purpose on the Canadian tax returns:
119288918RR0001 - WATCH TOWER BIBLE AND TRACT SOCIETY OF CANADA - North Vancouver:
THE PROMOTION OF BIBLE EDUCATION, PREACHING AND TEACHING THE GOOD NEWS OF GODS ESTABLISHED KINGDOM IN THE LOCAL AREA THIS INCLUDES HOLDING PUBLIC MEETINGS OF RELIGIOUS WORSHIP ON A WEEKLY BASIS, DESIGNED TO UPLIFT THE MEMBERS OF THE CONGREGATION AND ANY WHO ATTEND BY MEANS OF MORAL AND SPIRITUAL INSTRUCTION BASED ON GODS WORD THE BIBLE
119288918RR0216 - GEORGETOWN CONGREGATION OF JEHOVAH'S WITNESSES, Georgetown :
TO ASSIST THE LOCAL UNINCORPORATED ASSOCIATION OF JEHOVAH'S WITNESSES IN CARRYING OUT THEIR RELIGIOUS OBJECTIVE OF PREACHING THE GOOD NEWS OF GOD'S KINGDOM AND PROMOTING PUBLIC RELIGIOUS WORSHIP DESIGNED TO UPLIFT JEHOVAH'S WITNESSES AND ANY WHO ATTEND THEIR PUBLIC MEETINGS BY MEANS OF MORAL AND SPIRITUAL INSTRUCTION BASED ON GOD'S WORD THE BIBLE.