Unless you're the NRO/DoD and want to launch some really, really high power synthetic aperture radar satellites into low altitude polar orbits, with massive photovoltaic arrays to power the radar (or nuclear reactors, as the Soviets did)

Yeah, maybe, but you can fly those payloads out of CCAFS too. I don't think there will be enough demand for high inclination massive payloads to support BFR capable pads on both coasts.

America once launched a reactor into space, the SNAP-10A, from Vandenberg. (Unlike the soviet reactors it was just an experiment.)

At least it didn't pull an uncontrolled reentry over the Canadian Arctic.

Note that the USAF launches Delta IV Heavy payloads from Vandy on a regular basis. Vandy is also occasionally used to launch retrograde.

Vandenberg is also used for westbound, retrograde launches for ballistic missile tests and anti-ballistic missile tests, to Kwajalein.

BFR is projected to have ~5X the lift capacity of the DIVH. That's just a crazy amount of mass. I really don't see the call for single payloads of that size to the orbits that Vandy serves. I certainly could be wrong, but I just don't see enough current or future demand to warrant constructing a pad capable of supporting BFR on the west coast.

If you give the NRO the ability to put 14,000 kilogram satellites in orbit they will certainly use it. Even if most of the extra mass is extra propellant for orbit-maintenance ion or hall effect thrusters. A lot of "big satellite" applications that use buses the size of current 6500 kilogram, largest possible telecom satellites, would be very happy to have a few thousand kj of extra propellant tanks available for the same launch cost.

There is stuff that big already. The F9 can launch 22,800kg to LEO. The BFL would launch 150,000kg to LEO. Who needs that outside of human missions?

“This is not a moon...”