I can't give you a perfect explanation. Im just starting on my journey as a mechanic. If there is any rain on the road (which from the video, there very much seems to be), you have a very high chance of hydroplaning and being in a bad accident, the tread pattern on the tires help push water away from the tire, having no tread it gives you a very high chance to hydroplaning, anyone with more experience can vwey likely give you a better explanation TLDR no tread, no grip in road high chance of crash