I believe there is the spirit of evil in existence and God who is good did not bring it into existence. So, He manages it, in vessels (evil spirits and evil humans . . . Romans 9:21) for the sake of organization of it, on its way to the flaming sewer which burns with fire and brimstone.
But no person I know has ever told me this or taught this, that I am aware of. But I do not believe God or any created being brought the spirit of evil into existence > there is "the spirit who now works in the sons of disobedience," Paul says in Ephesians 2:2.
Right now, God is in control of all the evil, and with Him we can do any good that is possible, no matter what evil there is > "Do not be overcome by evil, but overcome evil with good." (Romans 12:21)
This is my main reconciliation > not the explanation above, but simply trust God and submit to Him and do the loving good that He has me doing with Him
I think a number of people are major suckers for their own so-called free wills, and without God they get themselves into all sorts of major messes. They do not control themselves well. They do not freely choose to get free of their spiritual and emotional troubles and torments and bad relationships.
Because their own nature is their dictator. Their self-involving character has them wanting to believe they can operate themselves. Our character can have us believing what we want to be true. We see this in how we choose companions, among other things. We do not see the real truth about someone, but seek after what we want, while we filter out things which are evidence that we are making a bad choice.
But God can correct us, change our character so we are in His light for seeing how love has us seeing things. Then we discover being free from our own egos' free will ! ! !
But while we are operating on our own, or suppose we are (consider Ephesians 2:2), we do not have Jesus Christ's "rest for your souls" (please see Matthew 11:28-30). We have a way of not freely choosing to rest in Jesus and obey how He shares with us and leads us in His love's "rest for your souls."
And "God resists the proud," we have in James 4:6 and also in 1 Peter 5:5. So, God is not respecting our "free wills" of pride, but He is resisting us while we do things in ego. And our nature is our dictator; we are not really free, but slaves of our own selves, and yet really of Satan (Ephesians 2:2) while we are living like we are making choices on our own and not sharing all and submitting all to our Father.
However, we need to love others, not try to control anyone, but treat each one like one does have a free will, though ones without Jesus are not free > Romans 6:17 >
Only God is good to bring us to all that is so beautifully wonderful and personally sharing and caring of His Heaven-quality family love. We have not been choosing to live with Him in this, I would say. But our Father changes and corrects us, in spite of us. And then we choose, in union and communion with Him (1 Corinthians 6:17, Romans 5:5), to obey > Philippians 2:12-13 > God works us into obeying Him; He is the One who has given "the increase" of our obedience > 1 Corinthians 3:6-7, 2 Corinthians 3:5.
Therefore, I need to be patient and humble with each person, not trying to push and control anyone, understanding that only God can do all that is really right with any person; so I love each one by being a growing good love example, doing any loving things God has me doing, however trusting Him for the real results > "nor as being lords over those entrusted to you, but being examples to the flock." (1 Peter 5:3) Because only God can bring any of us to all that is so good and so better than we could try to get anyone to seek and find and choose on their own.
If your free will has you choosing things apart from God's personal guiding, aren't you acting somehow in separation from God? I have been told that "sin is separation from God"; so, if I act in separation from Him, in my own free will, isn't my will free from God (Romans 6:20) and therefore in sin?? If my "free will" is my ego's freedom from God and His constant sharing and guiding in His love, then my "free will" is a major problem and subject to my selfish character dictating. This is slavery to self, not really free.
But if we are in sharing with our Father guiding us "continually" (Isaiah 58:11), we share in His freedom of His will ! ! !

instead of being free from Him.