First of all, the Bible makes it clear that God has no pleasure in seeing sinners die which lead them to eternal punishment (Ezekiel 33:11). He created man for His glory and for His pleasure (Revelations 4:11). Now here's a question... If you're God, will you derive pleasure from the "love" your created gives you if in the first place, you have programmed them like robots to give you love (they have no choice but to love you)? I believe that you'll agree that "love" that's not freely given is not true love. God had to give man a free will so that He can experience true love from His created so that pleasure is achieved. He wanted man to love Him willingly. Free will allows man to love God willingly. That's why God gave us free will. Not doing so goes against reason. God is a logical Person that's why He saw it right to give man the freedom to choose for himself and He hoped that we'd use it to give Him pleasure