What is anger? part 1 (What is anger hiding?)

What exactly is anger? What is its purpose? What is it hiding?
This is part 1 of my exploration into anger.
Part 2 is here: https://rumble.com/v339ogt-what-is-anger-part-2-what-can-be-done-about-anger.html?mref=pu5cw&mc=c5cy5

00:00 Introduction (general definitions of anger)
00:47 Factors of emotions
01:06 Time (Is anger about the past, present, or future?)
03:14 Why do we get angry?
03:31 Anger is about something that we can't change
04:18 Anger is a problem for ME
04:36 Anger is from an attack on my image of myself
05:28 Why do some insults make me feel another emotion like sad or ashamed?
06:18 I become angry when I disagree with an insult
06:47 I disagree with an insult because it's not true and I can prove it
07:28 I disagree with an insult but can't prove it's not true
08:06 I'm angry because an insult might be true
09:20 If I'm angry about some insult, it's because it's true
10:27 Being angry but it's not connected to a person
11:05 What is the purpose of anger?
11:22 Destruction as action
13:15 Anger acts as a guard to not look inward and feel the pain
13:43 Is anger good?