Susan said: Most backcountry trouble comes from you're own ineptness (if that's a word). In the city, you are at the mercy of idiots, drunks, terrorists, thieves, poor construction, and people who just aren't paying attention.
What you say is entirely true. But I think that the point is that in the middle of the woods, when the fit hits the shan, you have to rely on yourself to keep alive until help comes. You might have to spend 3 or 4 days staying alive until rescued.
In an urban environment, other people are around, and in all likelihood, help will be coming soon. In most cases, you will be on your own for a maximum of an hour or so.
But I do admit that you could be buried under rubble, and it may take a week for help to get to you. But this is an extremely unlikely event.
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Darwin was wrong -- I'm still alive