All the Nations that Forget God - Psalm 9

Psalm 9

The nations have fallen into the pit they have dug;
    their feet are caught in the net they have hidden.
16 The Lord is known by his acts of justice;
    the wicked are ensnared by the work of their hands.[c]
17 The wicked go down to the realm of the dead,
    all the nations that forget God.
18 But God will never forget the needy;
    the hope of the afflicted will never perish.

19 Arise, Lord, do not let mortals triumph;
    let the nations be judged in your presence.
20 Strike them with terror, Lord;
    let the nations know they are only mortal.

This Psalm I find disturbing.  The wicked go down to the real of the dead?  All the nations that forget God?

How does a nation forget God?  By not obeying His ways.  By setting themselves up above God, believing that they know best.  By a nation doing what is right in their own eyes (didn't we learn from Judges?).  Disturbing.  Very disturbing.  Praying for the changing of a nation.