In this case, they were actually attempting to accomplish something when the unexpected happened. What about all of the places in the world where there's a chain of events just waiting to be triggered? The more the infrastructure is neglected, the less stable it becomes, and the more prone it is to failure. But when that failure triggers something else, and a cascade of events starts to unfold, who's to say whether the person who triggered the initial event, whether intentional or not, is responsible for the indirect results?
I explored this possibility in a short story called "Cascade". It starts like this...
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It had all come down to Irwin's own testimony. Five nightmarish months of a high-profile court case in which his life was laid bare like a laboratory exhibit and washed with stain that allowed only one interpretation: terrorist. And all because he'd suggested a use for some cash left over at the end of a tech conference.
He looked up from the bible beneath his hand, and then over at the judge. His throat was dry from sitting for so long beside his court-appointed lawyer, agape at the fabricated version of his life that had been reeled out by the prosecution. "I do."
"You may take the stand."
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Read the whole story at http://klurgsheld.wordpress.com/2008/05/14/short-story-cascade/