This is the capillary action of the deep state: everybody married to everybody. Their parents sent them to the right schools, they met their mates, also from power families, they moved into DC culture, and did it again with their kids.
Good luck dislodging multiple generations of history’s largest and most connected family tree.
The Deep State was built over generations. It depends on bureaucratic stability: that the official you did a favor for will still be there when you need one back.
The solution is disruption: there needs to be mass layoffs of the upper layers, repeated frequently.