Some see illegal activity - I see consenting individuals being enabled to engage in free trade. Personally I would question anyone that would believe people shouldn't be able to trade their resources freely with consenting individuals. Humans shouldn't be slaves to the authoritarians they may have been born under.
The solution to stopping unethical activity should be to stop that unethical activity. It shouldn't be to limit and regulate all activity to simply make it less convenient to participate in unethical activity.