To my mind the guy commited two mistakes (a) he got married (b) he broke a rule that could endanger the entire aircraft.
As far as mistake (a) goes he got life for it!!! As far as (b) is concerned there is a fine line between making a mistake that may cost your life and cost an aircraft malfunction or accident and endanger everybody or almost abroad.
If some one does not wear a seatbelt (if the sign is on) it is his choise and his problem provided he does not hurt me by crashing on me during turbulence!
However if someone operates a mobile or obstruct an exit or the aisle or the gangway, then I want him punished if he insists on doing so.