For whatever reason, the official police report implied that a passenger struggled with the driver causing the disaster. The next day, video footage of the entire event was released (from the security cam inside the bus), showing a different story. The driver pretty clearly decides to go over the edge, turns the wheel, and does not flinch or turn it back as they go over.
After the video came out, dozens of major outlets covered the story. Almost all ran with "passenger hits driver causing crash", one or two did not specify a cause. No major outlet suggested [what seems to me to be] the most likely account, which is "driver deliberately drives bus off of bridge during argument with passenger".
In contrast, on youtube / other social media, most commentators pointed out that the driver seemed to crash deliberately, changing course many seconds after the passenger hits him on the arm with her phone.