Why did an all-powerful God murdered the Haitian people during the earthquake
Be careful in saying to God shit things you have in mind, God is not a murderer, murderer means the crime of killing somebody deliberately. A murderer is a criminal according to dictionary
John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
Satan is the murderer, to use the word "murderer" for God, it's not right because God does not murder, he owns the life so he have the right to take it
John 10:17-18 Therefore doth my Father love me, because I lay down my life, that I might take it again.
No man taketh it from me, but I lay it down of myself. I have power to lay it down, and I have power to take it again. This commandment have I received of my Father.
If the Lord Jesus Christ can take life, so much more God can take it.
When God take life, people die, and there is so much way God can take life, either by lightning, Sunami, earthquake or any other natural means but He's not a murderer, it is a way of taking back the life
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment:
Ecclesiastes 8:8 There is no man that hath power over the spirit to retain the spirit; neither hath he power in the day of death: and there is no discharge in that war; neither shall wickedness deliver those that are given to it.
Job 12:10 In whose hand is the soul of every living thing, and the breath of all mankind.