That white plane is on the ramp, well off the runway and not even close to being hit. The Harrier is skidding on a pod attached to it's belly and directional control would be minimal at best and would quickly be lost as the plane slows (especially with that small rudder). If he was steering, it was to keep it on the runway as that is the safest place for him and instinctual for any pilot. It just happens to also avoid parked aircraft but I doubt he was looking left or right for these, he was just focused straight down the runway. The right turn at the end might have been a conscious decision/rudder kick to turn the plane away from the ramp but it was probably the plane turning itself right as it lost speed/momentum and the right wing lost lift quicker than the left. Further, the right turn doesn't happen until after he was past your white plane.
This guy was mostly along for the ride. Until there was fire and/or the plane started turning off the runway it was probably safer just to ride it out. Add the fire and a turn toward unprepared terrain off the runway and it's now better to get the hell out of Dodge - so he did. I'd be willing to bet he would have punched a lot sooner if either of these tow conditions had occurred earlier, parked aircraft or not.
And yes, this too is all speculation. But I've personally watched 3 similiar incidents in my Navy career and another 4 or 5 belly/off runway landings in my civilian career. I've talked to the pilots and they all say they were mostly "just along for the ride".