No, the OT wasn't too harsh but it was necessary. God judges sin - sin is rebellion against God- this was shown in the OT. Sin is like cancer - its has to be destroyed or it will destroy others. For example, the Canaanites put their infants on a flame as a human sacrafice to their false god - this was just one thing they did out of many. I can't tell you the rest here because my grandmother couldn't read it which is the rule at this website. Thus, God destroyed the Canaanites to protect Israel from their very dark pagan deeds. Murder? God gives life and takes it away. He is the Creator and has that right. In the Old Testament God used Israel for his glory as a nation. But today in the New Testament we are saved by grace and Christ who became the perfect sacrafice - Christ fulfilled the Old Testament. Its the grace dispensation.
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