419 accidents involving self-driving (level 2 and 3), 18 deaths, 19 accidents with injury level unknown [0]. All deaths from level 2 vehicles. So being pessimistic, maybe 50 deaths from self-driving.

The people signing this are worried about AI that doesn't exist yet. No one died from nuclear weapons before they were invented.

[0]: https://www.slashgear.com/1202594/how-many-people-have-actua...