Quite the opposite IMHO. This helps reduce people who would hypothetically drunk drive on a Saturday evening, which in turn decreases the possibility that someone dies because of that (either the driver or a victim that was just passing / driving by).

Tbh, the sooner we remove the human from the equation, the better. It's scary to think that we allow so many careless people to drive vehicles that can kill people. I'm not talking just about drunk driving, but all the sort of distractions (smartphone, looking somewhere else, ...).

London specifically, AFAIK after midnight has no tube service. This means that Waymo (or whoever takes a similar initiative) actually helps towards creating a public transportation service that is cheaper and even safer than the current one. I'm personally all up for it - don't tax innovation!