There's a review of Andrew Lester's book The Angry Christian.
The book argues anger has a benefit spiritually as it helps us fight injustices. The review suggests that anger is more biological than spiritual; it also draws a connection between anger and sex.
I think anger does both. Spiritual anger,though, needs to be controlled both by the Word, and the input of others. Done individually, what we think is spiritual anger is often biological: meaning it's selfish. True spiritual anger is focused on God and His justice, not on protecting ourselves.
Thoughts and ideas on current events from an California evangelical perspective.