"Endangering" is an exaggeration based on what actually occurred it seems. What the car did was technically in violation of traffic regulations but it was careful to not hit anybody or cause significant damage to people's property as it did so. This is essentially no different than a careful driver ignoring (intentionally or otherwise) a sign restricting them from entering an area, but still driving through the area successfully without doing any harm. Technically, traffic rules were broken, by mistake (an algorithmic one most likely) in this case, but there were no lasting effects.

People make mistakes like that all the time, and sometimes they still get ticketed for that kind of thing, and other times they get a simple warning or don't get any form of rebuke at all. How many of us have never accidentally gone into a one-way traffic lane from the opposite side and managed to still drive through and get back on track without killing or maiming anybody? It's unlikely anybody would get charged with a crime for this, nor should they over a simple mistaken rule violation that did no harm.

The first comment is like saying I drove into a building when I entered my garage.

A self driving car can drive places it isn't supposed to be while ALSO very carefully avoiding colliding with anything.