This has been done in many places but apparently not in the Indian Ocean in the area of the tsunami. That failure of human action deprived people of the time they needed to seek safety on higher ground. The failure to protect ourselves was a failure of human will. The deaths caused by the tsunami were needless and are on us, not God.
The murder of children is also our sin, not God's. We've been given a code of life by God, a moral and spiritual path leading to virtue, charity and compassion. When we choose to stray from that path and instead embrace violence and death, it's our sad choice, not God's.
When we allow social predators to roam free and when we don't protect children from them, the blame lies with our failure to create a society of laws and reverence for life. Of course, an all powerful, benevolent God could stop all killing by simply removing our free will and treating us like Adam and Eve before their choice to disobey God's commandments in the Garden of Eden.
However, that world, as the philosopher Leibnitz observed, would be worse than our world, even with its dangers. That world would not include freedom, and freedom is an absolute good. So, in that sense alone, God is responsible for evil because God chose to give us a world where we could sadly but freely choose it.
We cannot have peace and goodness imposed upon us by God; we must grow into them through our loving and peaceful choices. This is what the prophet Isaiah understood when he shared God's words: "I form the light, and create darkness: I make peace, and create evil: I the Lord do all these things." (Isaiah 45:7).
God makes everything, but we decide what to make of it.