I can see this but even accepting this there's still bias. The south's ideology was bad enough that desertion among its soldiers would be at least as admirable as valor, and deserves equal celebration and commemoration.
Fun story, during WWII my grandfather was conscripted into one of the axis armies and his squad went out of their way to surrender to the allies without even having been first engaged in combat. That's admirable. That deserves a statue.
IIRC the pyramids were actually mostly built by a mix of professional builders and sycophants wishing to suck up the the royal family, slaves were used but only when they could not find enough of these first two groups