Take care about your own family and children. Do not harm others. It is that simple. If everyone would do that, we would be all better off.
#1 Take care about your own family and children #2 Do not harm others
Then, it becomes very easy to cause harm to others and justify it through the idea that one's first priority is taking care of your own family and children and that outweighs the harm you are doing to others.
Which is just to say, it's not that simple.
I used a not ordered list. That makes it so simple.