> It misdirects you away from who built the mower and aimed it.

What gives you that idea? Maybe it is true temporarily, but blame always gets extended to all parties considered related in the end. For example, if it were instead a child who came at you with a knife rather than a lawnmower, the guardian of that child would also be blamed. Hell, if you've ever worked with a lawyer you'll have noticed that they spend a lot of time trying to ensure that you don't get dragged into lawsuits as a secondary party exactly because those who seek to assign blame aren't happy until all those who can be blamed are.