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> If I design a bulldozer to push a five ton rock, did I push the rock or the bulldozer?

Unequivocally the bulldozer. You get to take the blame in design of the bulldozer, though.

The law (which is supposed to codify the common sense and shared values underpinning a society—note "supposed to") disagrees with you: if I use a bulldozer to damage your property, you can sue me, not the bulldozer or its maker.

Sure, legally.

But practically speaking, who did the heavy lifting? The operator or the machine?

Everyone who's ideas made bulldozer possible, I would say..

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