What if the passenger in the loo had, at the last stage of the flight, finally summoned up the nerve to detonate a bomb he had smuggled on board?? Any innapropriate behaviour these days has security connotations - surely the best thing would be to land the aircraft asap. The days of going around to prevent possible, but unlikely, injury to a passenger who is clearly breaching a security norm (i.e being seated for landing) should be consigned to the 'quaint but no longer appropraite' bin.
As for being over-zelous - ZERO tolerance of stupid and irresponsible behaviour is the policy I want to see enforced as a paying passenger.