The only thing that is evident to me is that the police are looking for information, any information that might shed light on what happened. To infer that, by the questions they are asking, they may have a bias is going a little overboard. Clearly they have the statement of the person driving the car. Since Bartel is no longer alive to tell his story it would be nice if the cops could hear from an independent witness. If someone stepped up and said "you know, I did not see the accident but I did see the deceased riding four blocks before the accident and he was riding normally, obeying the speed limit, stopping at lights, and so on", that is important information that might offer a different picture than the one given by the driver.