Interesting thread, and lots of interesting replies - not too sure where to pitch my reply..
I would have said that it was right not to take pictures, but am now not so sure.
I gave up using a camera many years ago as I once found myself in a cathedral in Spain (me being a pale faced tourist, in shorts, with camera round my neck) and as a funeral was taking place, I was not using my camera. However, a coach-load of tourists came piling in, point and shoots at-the-ready, and they snapped and flashed at all and sundry 'till the whistle went, then they piled back into the coach and sped off to the next city.
I felt so ashamed of being a camera-wearer that I gave up taking pictures for many years.
So, how do I feel..?
I don't know.
KayJay makes some interesting points, but as you would not have been able to do much to change the situation, I think I feel that it is something to have seen, rather than something to have exploited. I know that i would not have been able to take pictures, as my emotions would have taken over, but as so many have said, it is up to the individual to make the decision, and others cannot really judge.
As Fred Dawson says, it is the morals of the photographer.
Good thread Skyblueads