Because a lot of these women are kidnapped, drugged and held captive to be exploited as sex slaves for hungry and wealthy tourists who come here to do what they cannot do in their home country.
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Then the people who are involved in human trafficking should be arrested and severly prosecuted.
The consumption of alcohol causes people to crash cars, beat their spouses and children, get into fights, kill people etc. It has a horrible cost and effect on society. Should we make it illegal or just punish the people who commit crimes as a result?
The demand for drugs and prostitution will forever exist. The illegality of it attracts criminals who then perpetuate violence upon other humans to enforce contracts, increase profits, and expand market share. When drugs and/or prostitution are legalized it usually brings an increase of safety, not the opposite because now you have businesses who are paying taxes, following regulations, and bringing sunlight to the whole process. If the argument is that the government here isn't effective enough to properly regulate it, then the argument holds true that they will not be effective enough to enforce a ban.