I guess my point is an out of control vehicle can still fly over that curb and cream a biker and/or pedestrians so it seems (to me) like a good place for bollards.

But that would be unsafe because it might injure the drivers of the out-of-control cars.

(This really is the ‘logic’ traffic engineers often use. The cyclist or pedestrian that might be on the other side of the bollard is rarely considered.)