@spendius,
Interesting point of view, and quite correct overall.
Do you know that, in the fair city of Manchester, as late as the 1970s there were no pedestrian crossings on the main road junctions leading from the railway stations?
People making their way on foot into the city centre had to hope there were no amber-gamblers in the intervals between the green phases. And these were busy roads. You had to be fit, and alert. The blind, the halt and the lame had no chance.
Why? To try to maximise traffic flows I suppose. But it's self-defeating. When you close roads and bridges, surrounding traffic flows drop.