Land Rovers do not drive on sidewalks, for a start.

Bicycles and Land Rovers are both operated on the street. Humans are on the street as well, with varying degrees of protection. I often use the street while mounted on a bicycle. If my skull is crushed by a Land Rover's tire that will be a markedly different experience from my skull being hit by a bicycle tire.

Please elaborate; I don't really understand what you mean.

GP's point was that bicycles are fairly often operated on sidewalks. Percentage-wise, way more frequently than cars/trucks are operated on sidewalks.

GP's point was asinine as well. They have failed to address the core issue - the difference between operating a two+ tonne metal box and a 15 kilo bicycle, and how getting hit by either of those varies.

Have you never seen a car mount the pavement in order to get around a blocking vehicle? Or even to park, straddling the pavement and the road?

To park, not to drive. And the speed in this case is 2km/h instead of bicyclist doing 20 among pedestrians.

Bit of a strawman, since bicycles should drive in their own lanes.

"should" is the key word here.