[skybrian]

I didn't actually do the comparison. I asked a question. You can choose your own methodology.

But if you die, it doesn't matter whether it's human error or not, so it might be better to compare overall risk from all causes?

[benj111]

I understood it to be a rhetorical question, apologies if I misunderstood.

Driving encompasses both mechanical and human risks. Here we are talking about just the mechanical, so I don't think the comparison is particularly fair.