Why?
God created Lucifer and knew exactly what he would do and when.
bttt
Additionally, I believe that God is TOTALLY good and just. That’s why he demanded Christ’s sacrifice on the cross. Do you think he just wanted to do that for fun? He had to do it, because to do otherwise would be contrary to everything that He is. If there were any evil in Him, we would know, because He wouldn’t keep His promises. Where has He failed to keep them? Show me one and I’ll take it all back.