I don't like the bulldozer example for a whole lot of reasons, one of which is that bulldozers are designed to knock down houses - ask any demolition contractor since that's their most likely tool. Also, the Israeli government has used those same bulldozers for things other than knocking down houses, such as building roads, knocking down Israeli government buildings and repairing bomb damage. All of those tasks fall well within the design scope of the product.
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