My personal take is you do what it takes to protect your province/community and your children, provide anyone outside interested with the knowledge to do the same, and have faith that other people will see the truth that your way of living is the best.
People will do what they think is right, so many would engage in trying to shut down the sex trafficking by hunting down the people who do it. To ask whether people have the authority is in itself a slippely slope. Bc it entails that authority can/should be yielded onto other provinces
I presupose people are inherently good. But specially while there are communities who are punitive and authoritarian around, it likely would take a while for everyone to come to realize they don't wanna impose their will onto others; whether it be trafficking children or hunting down traffickers.
I believe that the end of Apocalypto exemplifies what I think ppl would - eventually - come to realize is the best course of action when put through horrible situations.