At every turn in the Bible we are left with some bad choices about evil. If God created everything then God created evil. If God is all powerful then why doesn't God get rid of evil, either God doesn't want to or can't. In the first case a good and benevolent God created an eternal nemesis and in the second an all powerful God can't get rid of it. On every page scripture leaves those things in tension.
Evil is here.
We aren't entirely sure how or why. And God doesn't seem to do much about it. This parable doesn't resolve the issues either. The enemy sowed the bad seed, the gardener did nothing to stop it and tells the servants to leave the weeds alone until the harvest. We want justice.