Good points
However, the economics is a bit different
It is cheaper to hack than to build a smart bomb this way
The scale is vast, it won't be one or two or 10 or just 20... it is the kind of thing that can be hacked in total
There are more kinds of enemies than just terrorists
Margins on autos are tight, and not a lot can afford a 5 or 10 billion $ sudden setback
Politicians have great difficulty simply installing traffic lights where there have been multiple fatalities without
Figure the cost of putting handicapped parking and accessibility everywhere, and give it a multiple, for "smartbomb-vehicle countermeasures": pickup and drop-off at the airport, etc., etc., congestion rules on the freeway, no parking or even getting close to the fertilizer plant which now needs vehicle barriers through open fields (which are 'drive-able'), etc., etc., etc., etc.,
Market Data 
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