If it is operating mechanically, then it is following a process chosen by the developers who wrote the code. They work for the company, so the consequences are still the company's responsibility.
The car is following a process chosen by Mercedes' engineers (to go forward when the user presses the accelerator.) The newsfeed is likewise following a mechanistic process driven by user input (they wouldn't be showing misinformation if users weren't uploading and sharing them.)
If the Mercedes infotainment screen had shown you a curated recommendation that you run them over, prior to you doing so, they very possibly would (and should).