God created the beautiful life and is the supreme well wisher of each and every being. Then how can the same God create sorrow? God didn't create sorrow, but the man did. It is not the God, but it is the untamed mind that creates sorrow; it is the ignorant mind, that considers this illusionary world as truth and runs after cravings of the momentary pleasures and in turn, creates sorrow; it is the restless mind that hankers for worldly happiness and creates sorrow; it is the unenlightened mind that is full of doubts about the Self and the inner world that creates the sorrow.
If someone blames God for the sorrows in life then that reminds me of a short story. One of the wealthy man of the village built a water well for the benefit of whole village. Once a little child fell into the well while playing. The mother rushed immediately to the scene and started cursing the wealthy man. Well was built for the benefits of the villagers, but if the well is misused, then it isn't the fault of the builder.