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I'm reading a book, and the antagonist was released from prison early because he bribed the district prosecutioner.
The main character says: 野郎。。。 法なんてあってねーようなもんじゃねーか
This is my translation: Bastard... It's like there is no law (lacking in lawfulness?)
But I'm not sure how もんじゃない functions here. I know もんだ/です can function as giving a reason for something. Is もんじゃない used similarly but ない is used because it is a negative verb?
Your translation attempt is spot-on.
This もん is a simple noun, "thing". あってないようなもの is a set phrase that means "a thing that exists but is like nonexistent," or "a thing that's virtually nonexistent". It's commonly used to describe how something is useless or meaningless.
