I agree also that many other feelings can lead to anger. This is simply my belief, but I feel God is the only one who is absolutely justified in anger. Hence the term righteous anger. However, we are always encouraged to pray and search our feelings. Leave any feelings or revenge, wrath and anger to God since he will bring all judgement when it is due according to Romans 12:19-21.
"Do not take revenge, my dear friends, but leave room for God’s wrath, for it is written: “It is mine to avenge; I will repay,”[a] says the Lord. 20 On the contrary:
“If your enemy is hungry, feed him;
if he is thirsty, give him something to drink.
In doing this, you will heap burning coals on his head.”
21 Do not be overcome by evil, but overcome evil with good."