Why have not airlines provide parachutes to every passenger for emergencies like imminent plane crashes?

If military planes have eject safety seats for their pilots in case of emergency, why have not commercial airlines provide parachutes for the passengers? Won't parachutes greatly reduce death casualties from plane crashes? By Lovelet DI think most of the time a parachute isn't going to make any difference....most crashes happen too high or too low...
use your imagination and think what would happen to you if you jumped out of a plane at 200mph.
SPLAT!
Because there wouldn't be time to distribute them and then instruct the passengers in how to properly get into and adjust them.

Plus its not as easy as just putting a backpack on and jumping out. There are speed and altitude requirements.

Lastly in most airplane emergencies there is simply not enough time to evacuate the plane in this manner.
Loevelet,
Great idea.
However, the weight of the chutes alone
would not make it profitable for the airlines
to fly the plane.
what a stupid question.can you imagine a crashing plane loaded with people and babies having ejection seats on a big airliner?the plane itself would explode as in the militatry they eject through the sliding hood of the plane.airlines dont have the top part of the plane with sliding hoods you dodo.from mikhal in israel.
Darlin we have enough trouble with crazy people on planes. Did you see all the news the last two weeks? Guy with dynamite, Kid claiming to have a bomb, woman boarding with a gun, crazy lady forces f-16 to escort a plane to Boston??

Ejector seats require training to use & many get hurt using them. The last thing you want is some kid popping out of a plane over NYC.......
Mikhal don't be rude...you don't need ejection seats to parachute. What do you think paratroopers do? They jump out of the door--which a plane has. The parachute thing would never work though--maybe one person on the plane would be trained in parachuting...
Because if the plane crash is a mid air collision, it's really not going to matter if you have a parachute or not. Most plane "crashes" happen either at takeoff or landing, and again, a parachute is a moot point then.
one do you know how long it takes to put one one, how do you give instructions to scaired passangers who are affraid becuase there plain is going down. no one would be able to get them on in time and they would all be getting out to close to gather and get tangled up so they are still going to die. and you know if they had them under the seets people would be stealing them every time the got on a plain