They plowed through a long line of seemingly children. I don't see how this was an accident. At any point they could have stopped, instead of hitting the next like 10 people lined up in front of them.I watched the video (not recommended) and it seems like it could have been an accident/hit and run situation. People frequently jam on the accelerator when they mean to be hitting the breaks, and then panic when they realize they've hit something and speed off (or try to speed off).
Sure it could have possibly started as an accident at second one, but then after that, it was just murder.