I wonder if any building code today would allow keystones, even though they’re incredibly strong. I have a lot of trouble imagining that today’s vault construction uses pure keystones. But President Trump would know the THEORY well.
I think you need to look at the concept of “remove the keystone and the structure fails”. So what is the most fundamental and pivotal point around which everything focuses? It goes, everything goes.
Money? Oil?
2nd would be control of the media.
3rd might be seduction of the military--which OThuga tried to achieve but didn't complete sufficiently to remove all patriots.