It's inherent to the system.
You could probably make the same Venn Diagrams with all Republicans, and if you couldn't currently it's only because of who holds the White House and thus nominal political control of all the regulatory agencies. (And Congress until this year.)
Look at the job titles for all of the right side...government relations, lobbyist, tax counsel, legal affairs, federal affairs, Congressional relations, etc. They're jobs specifically for these people to shuffle from the left side to the right and back again.