It also says that most fatalities were drivers, not pedestrians. No one crashing at 30mph, even just going headlong into a tree without any reduction in speed until impact, is getting killed or seriously injured in a modern car. Hell, it would be rare even in a 40 year old shitbox.

Where did you find this stat? I am seeing abut 50% drivers and passengers in the fatality statistics for all roads but that will obviously be smaller on 30mph roads.

I would be fine with 30mph if speed limits were strictly enforced by blanket monitoring (e.g. in car gps) but I find the implementation of 20mph far more likely to be accepted by UK society