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The extent of responsibility for a programmer who helps develop a violent video game for any consequences of that game can be debated. While programmers contribute to the creation of the game, they typically don't control how the game is used or interpreted by individuals. However, they do have a responsibility to consider the potential impact of their work and adhere to ethical guidelines.
As for restricting children's access to video games, it's a complex issue that involves considerations of parental responsibility, societal norms, and psychological research. Restrictions could be implemented through parental controls on gaming consoles, age ratings enforced by retailers, and educational initiatives to promote responsible gaming habits among children.
The question of restrictions for other groups in society, such as convicted criminals, would likely involve different considerations. It might involve restrictions on certain types of games as part of a broader rehabilitation or correctional program, but such measures would need to be carefully designed to balance rehabilitation goals with individual rights and freedoms.