So, essentially, every time one engages in the question of ethics in photography, one is taking the "moral high-ground" ? This reminds me of the time when, on another forum, I participated in a discussion about consent when photographing the homeless and someone replied that they were all "fair game". Didn't bother to go further into that discussion. Any photographer who thinks people are "game" doesn't deserve my time.
I happen to believe that you should care about the people you photograph, and that you photograph them in order to bring out their dignity. This holds especially true with the homeless, as with the many people who are suffering from poverty or war in Africa and elsewhere. That makes me a saint ? Gee, they've lowered the requirements for the job, but fine.
Now, if you take the time to read a bit and do some research (Dude, Google is your friend), you'll see that Magnum has been into a lot of controversies these past few years, and they have themselves acknowledged that a revision of their ethical principles is needed, especially regarding the photography of children and of the poor.
The problems with Bruce Gilden's style of photography are also well discussed, here and elsewhere. What he did for Médecins sans frontières (MSF) in Haïti, the way he photographed the victims of the earthquake, is problematic, at least, and this as other examples should at least make every photographer ask himself or herself basic ethical questions about what to shoot, how, when and why. And many do.
But I guess that would make too many saints out there, right?
Oh, and to answer you "who are you to judge" question: I am Haïtian, I've lost family and friends during the earthquake, and I've been there enough times to see the ravages of poverty. That's who I am to judge. But that doesn't matter. Anybody that possesses the combination of a conscience, a minimum of empathy and a camera should also feel the right to judge those who exploit the misery of others for their own photographic gains.
Not your thing? Don't worry, I won't judge you.