Anger.

I think it is because (unrighteous) anger is a powerful tool to control people.
I heard this on radio yesterday: Difference between righteous and unrighteous anger:
Righteous: when we are angry because someone insulted God
Unrighteous: when we are angry because someone insulted us.

I just heard a pastor on KHCB here in Houston say, the people that carry the most anger, are the folks that continually try to change people. I guess I never thought of that as something that would make someone angry, but it does seem to make a little sense. Any thoughts?

That is an excellent thought from that brother and it carries definite truth with it. Also anger would be when circumstances cannot be changed and we can submit to them or fight against them. Of course crying out to the Lord for deliverance is also right. When self is on the throne anger can abound, may we be living sacrifices (Romans 12:1-2), I need to be reminded of this daily.

Ephesians 4:26-27
BE ANGRY, AND yet DO NOT SIN; do not let the sun go down on your anger, and do not give the devil an opportunity.

James 1:19-20
This you know, my beloved brethren But everyone must be quick to hear, slow to speak and slow to anger; for the anger of man does not achieve the righteousness of God.

Proverbs 29:11

A fool always loses his temper, But a wise man holds it back.

James 1:20

for the anger of man does not achieve the righteousness of God.

Proverbs 19:11

A man's discretion makes him slow to anger, And it is his glory to overlook a transgression.

Ecclesiastes 7:9

Do not be eager in your heart to be angry, For anger resides in the bosom of fools.

Proverbs 15:18

A hot-tempered man stirs up strife, But the slow to anger calms a dispute.

Proverbs 15:1

A gentle answer turns away wrath, But a harsh word stirs up anger.

Colossians 3:8

But now you also, put them all aside: anger, wrath, malice, slander, and abusive speech from your mouth.

James 4:1-2
What is the source of quarrels and conflicts among you? Is not the source your pleasures that wage war in your members? You lust and do not have; so you commit murder. You are envious and cannot obtain; so you fight and quarrel. You do not have because you do not ask.

Proverbs 14:17

A quick-tempered man acts foolishly, And a man of evil devices is hated.

Proverbs 16:32

He who is slow to anger is better than the mighty, And he who rules his spirit, than he who captures a city.

Ephesians 4:26

BE ANGRY, AND yet DO NOT SIN; do not let the sun go down on your anger,

Ephesians 4:31

Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice.

Proverbs 22:24

Do not associate with a man given to anger; Or go with a hot-tempered man,

James 1:19

This you know, my beloved brethren But everyone must be quick to hear, slow to speak and slow to anger;

Proverbs 12:16

A fool's anger is known at once, But a prudent man conceals dishonor.

Psalm 37:8-9
Cease from anger and forsake wrath; Do not fret; it leads only to evildoing. For evildoers will be cut off, But those who wait for the LORD, they will inherit the land.

Proverbs 29:22

An angry man stirs up strife, And a hot-tempered man abounds in transgression.