Many of the ebikes in the video appeared to have throttles, where no pedaling is required. I think these might be class II ebikes. I too, think this makes them more like electric motorcycles rather than bikes. There were no details on the accidents, but I suspect in many cases, the ebike riders where going too fast simply because the power allows them the ability to go too fast. Throw in the fact the bikes, at times, rightfully shouldn't be restricted to roads, and it seems like an accident ready to happen.
My wife has a class I ebike and those require pedaling and only assist up to 20 MPH. It works out perfectly, you can't really go too fast, generally speaking, and you at least have to pedal to get the power assist.