Sure, but even dangerous tools can be made with some safety in mind. Do you REALLY need a shield for that circular saw? Not really, but those who use a shield risk having more fingers than those who don’t.
Personally, I prefer sheath blades, or a regular old dumb folding blades if absolutely necessary. Are they more safe than other blades? No they are not, but a simple, stupid design is better than one that has been specifically engineered to cut off as many fingers as possible (again, going purely from what the video shows, which looks about as safe to close as a butterfly knife).
EDIT: This comment did turn out more aggressive than hoped, and I’d like to apologies for that. Your comment is of course correct, but I feel that it does not fully solve my confusion and the problem at hand.