Have you ever thought about how many people have been killed by God? How many Old and New Testament characters did something so egregiously sinful that the Almighty deemed it necessary to straightaway cause or allow the penalty of death to be invoked?
Yahweh, our LORD, our God, was and still is the supreme ruler of all the universes. This is true whether or not you believe that. As such, God has been well known to punish humankind directly or use other forces to punish wayward people. He has chastened nations and individuals. To this day, God continues to administer punishment for evil, as He sees fit.
God authored the words that Moses scribed in Deuteronomy 32:35 "Vengeance is mine, and recompense, for the time when their foot shall slip; for the day of their calamity is at hand, and their doom comes swiftly." Verse 42 says, I kill ... I wound ... I will make my arrows drunk with blood, and mine sword shall devour flesh. Romans 12:19, of the New Testament (NT) reinforces the same thought; Beloved, never avenge yourselves, but leave it to the wrath of God, for it is written, "Vengeance is mine, I will repay, says the Lord."