It is actually more common then you think for a passanger to "jerk" the steering wheel. Numerous reasons can be involved, however one of the most common reasons is out of anger. I am not saying that is the case in this situation, however the DA could not press charges against someone unless there was valid evidence/reasoning behind the charges.
Until a case is prepared and placed in full action all evidence or reasoning isn't released.
I find it funny how people think that it is our right to know everything going on in a case that has absolutley nothing to do with us. It is more of people not having enough to do with their time other then being nosey.
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