Why does God allow good and evil to exist in the world?
You wouldn’t appreciate the calm and peace of this life until after the storm. That’s when you really appreciate it. You know when you appreciate your health the most is after you’ve been sick, right?—Then how you appreciate it! Oh and you never appreciate a little bit of necessary funds as much as when you’ve been flat broke and then the money comes, and then you’re so thankful.
But God allows that, He allows this bad or evil to show you that you never had it so good and to be more thankful for when things are good, and when things go good, and when you have it good, the good of all goals, and you’ll never be happy without that good in your heart, God’s good.