Not that I don't agree with you... I do. But, being brazilian, the idea of walking around at any time with my iphone out makes me cringe. I love my country, and I think everyone should visit it, but just keep away your iphones and anything of value while walking about, and you'll be fine!
I keep on walking around with my iPhone everywhere in Rio, so has my wife. Never been stolen! I use it everywhere, it's my only phone.
Maybe it's because I'm a big guy, the thiefs might be afraid to steal a big guy? but what about my wife, she's tiny.