Step-by-step explanation:
I think that all the statements are correct. Government are the law makers. They make law and rules for the welfare of human beings. If someone does wrong and violates those rules and law then it is the right and duty of the government to punish the wrong-doers. That is why I think that the statements "Crime affects society, so it is the government’s responsibility to bring cases against defendants to deal with them as harshly as possible",
"Individuals are never directly harmed by violations of the law, so they cannot be plaintiffs in criminal cases"
"A crime is a violation of the law, which was made and enforced by the government, not individuals" and "Individual plaintiffs might know the defendant and therefore cannot be impartial in charging them with a crime" are right. We are able to live peacefully because of the government. We are able to have rights, feel safe and change the rules and boundaries made by the SOCIETY all thanks to the government. Yes there are some cases where the government's judgement are doubted or are proved wrong. But that doesn't mean that the government in every country does the same and is unfair.
I should have chose one answer as mentioned but I think that each of the statement is right.