It is not a fact.
As of right now, no nation has enacted legislation requiring airlines to make sure that blinds stay open throughout takeoff or landing.
Although snipers may shoot through an open window blind, it would be extremely difficult for the police to kill anybody other than the passenger occupying the window seat.
Furthermore, on landing, no reputable hijacker would definitely insist that all passengers be seated and that window blinds remain closed.
Flight attendants actually only insist on the blinds staying open out of sheer safety considerations.
First of all, have you observed that the lights are turned up during the day or are muted during the takeoff or landing?
They do this to make sure your eyes are properly acclimatised to the outside environment of the aircraft, which is also the reason they require you keep the blinds up.
The last thing they want is for you to be dazzled by the light or have to wait for your eyes to acclimatise to the dark if there was an emergency and you were instructed to evacuate the aircraft.
In an aviation emergency, time is of the essence, and losing vision as soon as you exit the aircraft might significantly slow down your escape velocity from the downed aircraft.
Second, you and the crew can see what’s outside the plane while the blinds are up.
It is hoped that if something went wrong, like an engine fire, you or a crew member would notice it.
It would also be possible for the passengers and crew to determine whether side of the aircraft is safe to escape.
Leaping out of the door and into a fire is the last thing you would want to happen.
In order for rescuers to witness what is happening inside the aircraft, there is a third reason. If there is smoke or a fire in the cabin, they could detect it.
The 1992 hijacking of Air France 8969 is most likely when the sniper rumour originated.
Terrorists from Algeria took control of the aircraft during the event with the goal of crashing it either Paris’s Tour Montparnasse or the Eiffel Tower.
At Houari Boumediene Airport in Algiers, French counterterrorism commandos from the National Gendarmerie Intervention Group (GIGN) attacked the aircraft in retaliation.
Snipers from the GIGN stationed themselves on the airport’s roof to observe the cockpit while GIGN commandos broke inside the aircraft.
During the tragedy, all four terrorists and three passengers perished.
