Why does the US ignore the UN when it has a vested interest in its helpful invasion?

have you ever witnessed anything that the UN could agree on? and then follow up on in a positive way.. Most of them are abunch of weenies that use the UN as a forum to complain..Personally I think we should lock the doors and tell them all to go home.. Maybe if they had to live and survive in their own countries they would have a change of heart.. send them all home starting with Annan