Wikipedia: Westboro Baptist Church

From Wikipedia:

We don’t picket to win people over, idiot. It’s to harden people’s hearts. Make them hate. Make them hate God even more than they already do.
Our goal is to preach the Word of God to this crooked and perverse generation. By our words, some will repent. By our words, some will be condemned. Whether they hear, or whether they forbear, they will know a prophet has been among them… our goal is to glorify God by declaring His whole counsel to everyone… we hope that by our preaching some will be saved.

Here.