There has been a brutal war in Chechnya and Russia has seen several large terrorist attacks. I doubt that the Russian police have a pro-Muslim bias.
The initial reports of the crash in Moscow sounded like it could be similar to ISIS attacks that a occurred in France and other locations. An important difference in the Moscow case is that there is no evidence of any advance planning. The driver did not rent or steal a truck or large van to maximize damage. While the driver, Anarbek Uulu, is from the former Soviet republic of Kyrgyzstan where the majority of the vast people are at least nominally Muslim, Kyrgyz citizens have generally not been involved in the earlier terrorist attacks.
There no evidence of the any connection between the driver and terrorist groups.
The judgement of the police that the crash was a result of a tired, relatively inexperienced driver accidentally stepping on the wrong pedal appears to be consistent with available evidence.
In my opinion, the video of the Moscow crash and the driver’s history are similar to those from the Charlottesville crash, but the response from authorities has been totally different. The Moscow driver is unlikely to face any criminal charges, while the Charlottesville driver is in prison facing multiple state and federal charges including murder.
US authorities (Jeff Sessions and others) and the news media (CNN and others) here have already declared the Charlottesville crash to be a “terrorist attack”, so the ability to get a fair trial that considers is already compromised. The possibility that the crash is actually a terrible accident has effectively been removed from consideration or discussion.
