What do you think is the rationale?

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Interesting Judaism rules 1. To break the neck of the firstling of an a$$ if it is not redeemed. 2. To circumcise the male offspring. 3. Not to rob by violence. 4. To exile one who committed accidental homicide 5. That one who has raped a damsel and has then (in accordance with the law) married her, may not divorce her. 6. That every sacrifice be salted. Please answer by the assigned numbers. What do you think is the reason why they put up these laws? Be creative.