Nonreligious but I always kinda thought of the whole thing the same way that evangelion teaches. Where pain and suffering are critical for pleasure. You can't win without losing being on the table. Without suffering and death good or evil there's only apathy and numbness. And that's why God created evil. Without evil your neither good or bad because everything is predetermined and maybe God is just a bored writer trying to put a little bit of drama to make this world he made interesting. Ya never know we might be his version of star wars or Lord of the rings. As a artist you can say I'm god in the eyes of my OCS and I never make my worlds comfortable utopias because no one would be interested in seeing that story continue on for thousands of years let alone billions.