Some human law is logically derived from natural law. This law is universally binding on all cultures. The power of human law 1. It should mostly concern itself with those vices that hurt others and those actions that promote the common good. No, it is concerned with those acts involving the common good.
Personal morality is an individual responsibility.
In other words we have a duty to obey human law. In one sense the law applies to everyone, as all are bound to it both by fear and by conscience. Under certain conditions, like emergencies, there can be exceptions to the law. Change in laws 1. Yes, it can be improved with new understandings and changes in circumstances.