It is true. Any injustice that occurs must lie with the laws or those enforcing them. This is because, ideally, the laws are decided by representatives of the people and enforced by those accountable to the people.
In the U.S. for example, a bill has to be voted on by both the houses of Congress, the House of Representatives, and the Senate.
The three arms of government mentioned above comprise the citizens of the united states and no other country. Hence, if there is any injustice, it must be traced back to how the laws were enacted and those enforcing them.
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