Well, the self-preservation argument gets weaker if he fled/hid from law enforcement. If he went to a safe place, then contacted them, there’s no case.
The vehicle was being attacked before it ever went into the crowd. Armed individuals immediately started attacking vehicle as soon as it came to a stop prior to going into reverse. At the point your seeing all this, the driver is likely thinking, "Ho*y s**t, if I stop, I'm dead"
Based on everything I've seen and reviewed, I'm pretty confident at this point that is what the Fields was thinking. He wasn't too concerned with the cops at that point, because all they'd done all day was stand off on the side lines looking professional. It's all in the videos....