.How exactly would you bring down that wall without dropping it on the sidewalk.
It's not so much as how to bring the building down without getting any debris on the sidewalk since there are many unknowns in demo work and you have plan for the obvious. The most obvious in this case is the fact that there will be some debris that will fall onto the sidewalk.
The demo contractor should have obtained the proper permits to shut down the sidewalk and barricade it to protect the general public.
This particular case is just gross negligence. Most cities have codes, permits and regulations regarding demolition, sidewalk closure and general public protection from construction/demolition activities. The "contractor" in this video obviously disregarded the regulations and
common sense and showed his true colors as the hack that he is. My $.02.