Before making any sort of judgement about what happened, I would want to (a) hear the driver's side of the story and (b) see the entire video, not just the snippet that was available on YouTube.
I am not in any way condoning driving on the sidewalk, although I have done city routes where parking on the sidewalk was a customary and accepted practice.
Yesterday, I had a delivery for a house that was holding a garage sale. It was on a narrow, two-lane road with no shoulder, outside of city limits. People had illegally parked on both sides of the road, partialy blocking it, in order to go to the garage sale. There wasnt anyplace for me to safely park, so I pulled into their driveway, turned, and drove 20 feet through their garden (between rows of vegetables where their tractor normally went) and out into their field, did a U-turn on the grass (they had just cut hay so there were bales everywhere and the grass was stubble) and parked in order to make the delivery. The customer was happy to get her package and apologetic about the parking problem. My point in all that is that if someone had happened to film me at just the right moment and from just the right angle, it would look like a crazy UPS driver had just plowed right through a garden with his truck for no reason when in fact that is not what really happened.