OK let's run with that. If this low-height bollard was a wheelchair, pram or blind person, they would be dead, presuming the driver hadn't seen them and taken avoiding action.
If a wheelchair, pram or blind person had been standing either side of this low-level bollard in the path of the SUV they would be dead too.
Not great is it?
What if it had been a full-height bollard vehicle-stopping that was easy for even the most oblivious driver to see? What would have happened then? Well, firstly there is high chance this SUV wouldn't have mounted the pavement, and secondly a wheelchair, pram or blind person located beyond the bollard would have survived.
This sounds to me like good argument for replacing this low-down bollard with a taller, more-visible one.
But apparently I'm wrong and there is some sort of argument for why this low-down bell-bollard is a better choice for this location. I know they're meant to deflect the tyres of large vehicles, but it's worth considering what exactly the highways authority were trying to prevent by the installation of this bollard, and who (or what) they were trying to protect.