Next, the fourth angel poured out his bowl on the sun, and it was given power to scorch the people with fire. And the people were scorched by intense heat, and they blasphemed the name of God, who had authority over these plagues; yet they did not repent and give Him glory.
And the fifth angel poured out his bowl on the throne of the beast, and its kingdom was plunged into darkness, and men began to gnaw their tongues in anguish and blaspheme the God of heaven for their pains and sores; yet they did not repent of their deeds. ~~ Revelation 16:8-11
God is holy. Holiness when applied to God refers to everything that separates Him from His creation and His creatures. It includes moral purity but it’s not limited to that. God is self-sufficient, infinite in wisdom, all-powerful, all knowing, omnipresent. He sees the beginning from the end. We are none of these things. We are finite and limited and imitate God in certain ways but cannot be like Him in every way. He’s holy and in a category all by Himself. He cannot be compared to anything or anybody. To do so is to make a categorical error. Universalists compare God to Hitler because of His fiery hell and therefore blaspheme His holiness. If God has morally sufficient and justifiable reasons for hell then hell isn’t unjust. His holiness remains intact. Because of God’s holiness He’s in a privileged position. As finite and limited creatures we are to depend on Him in humbled trust as we walk in mercy and love. God is holy. He’s no evil monster.