Downhill skateboarding is inherently dangerous, regardless of how you look at it. There are so many variables (cars, telephone poles, animals, other skaters, guardrails, rocks, road conditions etc) that skaters are doomed to fail eventually, and some of these fails happen to get caught on video.
This is a video that did go viral (3 Million + views), and features no unsafe riding. As a downhill skateboarder, watching videos where people mess up is fun, and I know not to judge all downhill skateboarding like this. However, I think it severely harms the sport when people do share those videos, which only hurts the downhills public image.