For an in-depth analysis see R Yitzchok Breitowitz's article"The Desecration of Graves in Eretz Yisrael:
The Struggle to Honor the Dead and Preserve Our Historical Legacy" at
Avodah's moderator Michah Berger adds
"Halachic Problems", sec "A. The Prohibition of Excavating a Grave".
Note that there are other reasons to matir disenternment, which may help give some scale as to the exact extent of the need.»
I grew up with R Yitzchok Breitowitz in the Hartford area.