I thought that was an interesting piece. I think that in any group you'll have people that won't handle the tour tactfully, and be disrespectful. Which if I was to do one of the tours I'd be nervous about having someone like that in the group.
I like the closing piece about the one way conversation. I'd be most wanting to learn about the conditions and talk to people, but through a tour setting -- otherwise I'd be too uncomfortable to enter a slum myself or strike up conversations.
I think small groups with a good tour leader who explains responsible tourism could have a good effect on awareness. When I was on a tour in Egypt our tour guide took of off the beaten path in a small city in central egypt away from all the tourism. It was an eye opener.
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