That's a loaded question, but sure, let's go there. The problem with public transportation is that the public is allowed to use them, and the rules, legal and social, are not well defined or enforced. Assaulting other passengers is generally tolerated by the system, depending on the type of assault. Physical assault is considered too far and doesn't go unnoticed, but chemical and audio assault on fellow passengers usually goes unreported. The types of people are those who would assault others on some fashion.

Whether this translates to Waymos smelling like meth or fentanyl when you get in them thanks to the previous rider remains to be seen. Or just needles, foil, or used condoms left behind. They record video, so Google could close the person's account so they won't be able to book Waymos with that account again, so we'll end up having to see how hard it is to create new accounts to use Waymo on to ban nuisance riders.