This has evolved into a really interesting thread.
I believe that there is a whole lot more moral outrage out there than action, so the actions that people took in SF to go after these traffickers and do the right thing for the victims is a great thing, for many reasons. The most important reason is that it takes communities self-policing to rid themselves of unwanted or undesirable activities. It takes a rational government monitoring to make sure the crazies don't get together and run amok over legal, ethical, moral activities.
The issue often becomes the intersection of the unwanted/undesirable and the legal/moral/ethical. Great social change is often the result of catastrophe as was pointed out - the Depression led to the New Deal, AIDS changed a lot of peoples minds about sexual values and mores - but in in the absence of a visible, palpable and potentially (or really) personally costly outcome, it takes a few dedicated people a long time to input the amount of energy it takes to make a difference.
I believe that as Americans, we are bombarded with news and images from everywhere every day. So much of it becomes background noise to many people - not because they are uncaring or callous, but to some degree I think we just block out the endless noisy fugue going on around us. And I think many don't have both the deep seated and healthy values required to latch on to and hold onto an issue to the point of taking personal action - or lack the time, energy, resources, or how-to knowledge to make it go. And, we are an excuse-making society, and unfortunately many make excuses both for themselves and for others, not to mention forgetting that todays exploited migrants and immigrants are a lot like the people that came to the US to become our Grandparents or Great-Grandparents.