Yes, there is a righteous and sinless anger. The Bible speaks about it and it is usually an anger on behalf of others.
Saint Paul speaks of being justifiably angry, but it must not be a sinful anger. It must be controlled and righteous."Be ye angry, and sin not; let not the sun go down upon your wrath; neither give place to the devil."
The monks of the Holy Mountain who spend their entire lives striving for apatheia still knew that they had the freedom in Christ to write to the Ecumenical Patriarch "filled with righteous anger."
Karyae, 11th/24th May 1999
His Most Reverend All-Holiness
The Ecumenical Patriarch Bartholomeos
Most Holy Father and Master,
<snip>"For this undermining of the holy Orthodox Faith, we not only grieve, but are also filled with righteous anger."
Letter of the Holy Community of Mt. Athos to Oecumenical Patriarch Bartholomew
Concerning His Compromising of the Orthodox Faith and His Episcopal Officehttp://www.orthodoxinfo.com/ecumenism/athonite_bartholomew.aspx
Please stop cross posting.
All your cross-posts have been moved here where the first post appeared.