legacy of Plato P1

To some , he is considered as father of republic. But here his contribution to it is  not discussed but how his ideas impact the modern world. According to Plato, everyone should do their best for the common good. Does he means that everyone should assist one another if they are in need? Therefore, the law should force everyone do that. Right. What if people start to abuse the law in order to purposely hurt someone? Or what if their moral responsibility tell them to help one but other?