The article implies that the bottom halves weren't inscribed or differentiated, and so in retaining the important half, the graveyard was cared for indeed, and $45 was earned on their sale, and someone now has a memorable home. I would argue that the home isn't made of gravestones, since without markings they again became ordinary marble slabs.
(Disclaimer: I am a Catholic who venerates holy relics and finds charnel houses fascinating.)
That a hundred years ago these cemeteries weren't treated with the same reverence we expect today doesn't seem surprising. The way our culture treats dead soldiers has changed a great deal in a fairly short period of time.
More on this subject: http://www.remembrancetrails-northernfrance.com/history/grea...
The real sad thing about this is that those are only the positively identified remains. There are twice as many unmarked graves. And a nearby Confederate cemetery has 30,000 buried and only 2,000 identified.
https://www.nps.gov/pete/learn/historyculture/poplar-grove-n...
They could either not care for the graves at all, or care for them a little bit. I can practically guarantee that there was someone at city hall that fought to get even this much.
Did it really cost more to mow around them than to cut them in half? Sounds like the man had some corrupt friends in city hall who got him a great deal on marble blocks!