A faulty break pad or an engine doesn’t take decisions that might endanger people. Self-driving cars do. They might also get hacked pretty thoroughly.

For the same reason, I’d probably never buy a home robot with more capabilities then a vacuum cleaner.

Current non-self-driving cars on the road can be hacked

https://www.wired.com/story/kia-web-vulnerability-vehicle-ha...

But even if they can theoretically be hacked, so far Waymos are still safer and more reliable than human drivers. The biggest danger someone has riding in one is someone destroying it for vindictive reasons.