It is one of the marks of bad screenplay or movie writing: Kill all your characters because you can't think of an ending for them, or to get some tears and emotion out of your reader w/ having to "work" for them.
When done right, without cheapening the death or using it just as a way to jerk the tear ducts of your audience, or when the deaths are meaningful in some other way than the obvious emotional impact, yes, it is a good plot device.
I hate those "Street Vigilante" kind of movies when you see a cuddly family and cute kids on the first scenes and you just know they will be barbecued, mowed down and / or get other horrible death, just to "justify" the movie hero turning into a serial killer with some teeny scruples (kills only bad guys who deserve it, by the most violent ways possible).
Don't get me wrong, I like action movies, what I dislike is the cheap manipulation of my emotions those cheesy movies try to do. Lethal Weapon didn't show us Mel Gibson's wife getting offed and it was a very good enjoyable movie, for instance. Whereas any Steven Segal movie started with "wifey and adorable kid get thrown in the meat shredder". It was never a surly teenager or a noisy kid who got offed. It was always a cute as a button little kid with puppy eyes saying "I love you dadd.." POW! The kid's head explodes in a blur of blood before he/ she even finishes the sentence. Yuck! I mean, can you be any more obvious in your attempt to milk my sympathy ?
EDIT: What infuriates me more is that most times they succeed and I do feel my eyes stinging:rolleyes2
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