This captain is right in stating that the safety of the flight was affected by the offender smoking in the toilet.
The offender was not identified and as such he had a weak argument in keeping all pax on board.
If now the spin-off of this court-case could be the installation of cameras or another system that start when the smoke alarm is triggered to enable to identify the offender the this captains actions served all of us.
Over the top; maybe; but definitely, in case of doubth he deserves our support.
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Smooth Trimmer