Sure, for the person performing it. In this case, people were put at risk who had no opportunity to opt out. And just to clarify, the problem isn't the autonomous driving demonstration---it's the lack of a backup in the form of a human driver in a position to take control if something went wrong. That's a shocking level of complacency given the inherent risks of a fully loaded 18-wheeler truck and the immaturity of self-driving technology.