The rabid dog defense.
A God of love would not hesitate to put down a dog who was personally causing danger to other people out of love for them. Such a God might also end the life of someone in extreme mental anguish. But that's subjective unlike the first, because it's akin to putting down a cat who's old and blind. In our family we don't do euthanasia, only putting down rabid animals. Wel, actually we didn't have the heart to kill a rabid groundhog either (I could tell irt was rabid because of its aimless circular wandering), because it seemed like it was gonna wander into traffic anyway.
The point being that being stuck in sin is a bit like being rabid. You hurt other people and yourself. Such cities basically are a blight that needs to be put down because they continue to blame others (and invade others) because their state isn't working. Ninevah for instance was gonna nuked to the stone age with Smite Greater City spell. Part of God's redemption plan is to repeatedly offer people a way to turn their lives around. Most people are cool enough to have unsatisfying boring lives. While God probably doesn't like this, we can't all be Mother Teresa, and it's hardly a sin.
Rather, the truly wicked are deeply ashamed of their lives, and spend most of their energy trying to hide their faults. What God hates far worse than a slacker isbeing a neurotic perfectionist (trust me, I was one for the longest time) or being obsessed with being "normal." It is important to have friends, but shunning people because they are odd is not cool. I've been rejected by alot of job offers, because I'm either so nervous that the interview fails or I'm honest about my stuff and they are the type that thinks abnormal behavior needs to be shunned. You may think, " What wrong with shame? Doesn't it keep you from sinning. " No. Shame keeps you in sin. As long as you think God won't forgive you, as long as you think people won't forgive you, you walk around angry and messed up. And as long as you are trying hard to look perfect, you can't really function properly. You are cut off. You get split enough from other people, you get in arguments and fight with people.