> Number of people killed on the roads every year due to cyber attack: 0
How do you know this? The beauty of a cyber attack is that it can be made elusive. And the number of people killed on the roads by failing software is certainly not 0.
I think it's a super-reasonable guess that it's approximately zero. Maybe it's a thousand if you're super imaginative? I think you'd really struggle to make a serious argument that it was a bigger risk.
First of all, that wasn't my claim. Second, the amount of circulating car that might be a vector for a cyberattack is so small that the 0 in the statistic could very well fall in the range of expected deaths when corrected for other factors.
I.e. if there's one vulnerable car every million 0 is what you'd expect deaths to be, not an astounding result.
Number of people killed on the roads every year due to normal crashes: 1,350,000
If you're optimising to reduce risk of the former at the significant expense of increasing risk of the latter... I think you're a fool.