Why are traffickers growing bolder and richer?

No country is immune from sex trafficking, and the United States has a significant trafficking problem that potentially extends into every state and county. Women and children everywhere—even in the heart of America’s heartland—are being exploited. Yes, even in the U.S. this evil is increasing and destroying lives, despite a proliferation of federal and state anti-trafficking laws, awareness campaigns, law enforcement training programs, activism, growing media coverage, and even Hollywood films on the subject.

Why are traffickers growing bolder and richer? Why are the numbers of victims ever increasing? Who is ultimately responsible? Where do you think the greatest promise for combating human trafficking comes from (NGOs, legislation, enforcement, etc.)