Sexual slavery is really an example of capitalism at its worst. If the private sector had its way, sexual slavery would be rife. In order to limit sexual slavery, the freedoms of enterprise must be curbed so that they cannot enslave innocent young girls for their profit.
This is why government must intervene to set laws that protect human life, why government must fund police departments that investigate sex trafficking.
We can hope that public servants can be idealistic enough to create laws that protect the innocent and police also be idealistic or altruistic enough to implement these laws.