I still don't understand how land speculation makes things better for society. If I'm mistaken, please, explain why. Well, my inability to explain my points does not make them invalid. I assume that others, more capable than I, will do a better job. Let me take a stab at your proposition that people are made better off by lower land prices.
Land prices act as an allocative device.
While this is useful where densities are low, it is a disaster for the welfare of people where densities are high. In any event, land value taxation does not lower land prices . I would presume that this would be a corollary to the theorem that the land value tax is allocatively neutral. So the proponents of land value taxation should not suggest that the price is diminished in the sense of what the ultimate land user pays.