I never pretend to understand the wisdon of God. But I can't understand how murderous Islamists, Boston Bombers, Hitler or Pol Pot, among others, could give Him pleasure.
For every one of those truly evil creatures serving Satan, consider the many who are truly good such as Ronald Reagan, Sarah Palin, Ted Cruz, Louie Gohmert -- and that's just off the top of my head and only from within the past 30 years or so. Each one of those (and there are many others) is a witness to God's eternal Goodness. And, I'll hasten to add that the Lord's Divine Justice will be equally eternal and unyielding for the likes of those murderous Islamists, Boston Bombers, Hitler, Pol Pot and, notably, the equally vile Ted Kennedy, murderer and abortionist.