If God were just angry all the time I imagine we would lose our fear. We would probably move into avoidance. Why fear an angry God if there’s nothing you can do to make him not angry? You’d pathetically give up and slouch into your fatalistic future.
If, however, God is also good, then we’re in trouble! We fear God because He alone can forgive.
God does not like sin, it makes Him angry, He wants to pour out His wrath on all unrighteousness and ungodliness. We are unrighteous so we deserve His wrath. This is not good.
But God is good! He has provided a way to escape His wrath. Now we are accountable to receive His goodness. We need His goodness. We are wholly dependent on Him! The result is fear.
You can believe my logic or you can take God’s Word for it.
“But there is forgiveness with thee, that thou mayest be feared.”