Anger and Wrath

We are living today in an incredibly angry society. Although there is righteous indignation, our anger is caused most of the times by Satan, the destroyer. And still, we are told that God Himself will pour out His wrath over disobedient and rebellious mankind in the future. How can we reconcile these seeming contradictions? WHY does God tell us that we must overcome anger and wrath? And HOW can we do it?
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