Because european streets are much smaller and more bendy

I must be old but I still don't get why we want self-driving cars. Self-driving subways and trains, maybe, but I just don't see the need (from ordinary people) of self-driving cars. Can someone enlighten me?

I guess one of the reasons is "machines are more consistent than humans". But what if I just trust myself more? Then I still need to pay for this feature because maybe every car will have this as default and they just hike the prices anyway.