Are doctors justified in taking industrial action in defence of their pensions? No

No. Everyone is suffering at the moment, striking will harm the patients we say we are trying to care for, no matter how "routine" the care we try to deny them.
Why not withdraw cooperation from the CQC, the revalidation process and clinical commissioning groups? As these organisations and processes are not likely to achieve anything of note, ignoring them is unlikely to do any harm except to the pen pushers who's jobs depend on them.