Aww man, you can't really think that was done for any reason other than to wipe the slate clean can you? Cameron was hated (at least disliked) by many people involved (including Siggy) with the series. He has expressed his frustration before. Even the british crew didn't like this American making the sequel to Alien. They didn't like the direction he took the movie. They erased what he did.
At what point in history do we hear about Sigourney hating, or even disliking, Cameron? Honestly, if it's on record I've never heard/read about it so I'd be interested in getting that information.
Sigourney was one of the producers, she openly shuns guns in a big way.
They might as well have put my name in the credits under Producer for all the invovlement she had in the film in that respect. It was litteraly namesake. You want a Producer credit? Sure, whatever, you're a Producer.
She is very anti gun. Once the 2nd movie raised the bar to multiple Aliens actively stalking and fighting with humans. You can not just go back to one Alien in the dark... you just can't.
Allow me... why?
Earth is our origin, all ripley talks about is what if these get to earth. It has been the underlying theme since the first movie...
And so if the major theme is for the Aliens to never make it to Earth you think they should have?

If all the movies were actually one movie, Alien3 would be the misdirection movies use to keep you guessing.
So you like generic, predictable films then?
this is the studios move and possible Sigourney's too, to make her the complete underdog and to underline that she is "their" true center to the series.
As characters goes, she is. I'm not really a Ripley fan, but I can at least see that. Anyway, how would you have had it? Kill off Ripley in the beginning and let Hix 'n' Noot shine as the stars? Or should Ripley have disappeared into the background and let the inmates steal the show? The series, culminating in
Alien 3, was about Ripley's journey against these things. Why are you so shocked she was at the centre of the film?
I am telling you, if she continued to make these movies.... she would eventually have changed the title to R I P L E Y.
Statments like that make me take your opinion less seriously, not more.

In the next movie they did the same thing only this time she is part Alien... merging her with the Aliens. Making her not just a survivor, but even more unique in some way. As if being the survivor doesn't make her special enough.
There are very few fans that will disagree that
Resurrection was unnecessary. Ripley's story ended in
Alien 3. But daddy needed a new pair of shoes, so...
Naw man, you are not seeing it clearly.... not only do they look to her for advice on the Aliens, they can't seem to even naivgate their own world without her. Even in the movie Aliens there are moments when I cringe. The whole universe is written WAY too dumb for my taste.
Begs the question again - so why are you a fan?
Compare a movie like Predator. Anorld is the hero, we all know he is going to be the one who survives. Never any doubt about it. But look how all the others are written. They are all just as smart and as capable as he is. In fact they let the predator slap him around near the end. THAT is how a hero should be portrayed. Ripley is more like Bugs Bunny, always in on the joke while everyone else is is laughed at.
You really seem to like to exaggerate your points. In the first film she was as helpless as everyone else. In
Aliens she had prior knowledge of their existence which made her valuable to the mission to LV-426 but she was hardly portrayed as knowing everything about them and what to do to survive. And in
Alien 3 of course she was more experienced with facing the creatures, it was her third time. If she hadn't learned something from her past two encounters she'd have had to have been a pretty dumb bitch, wouldn't she?
They got her didn't they? If those were Aliens she would have sensed them....LOL
See earlier point about taking your opinion seriously after comments like this.
In my opinion she is a major part in ruining the best sci fi movie series.
So basically you wanted three or four films with nothing but Aliens running around doing... what exactly?
Because there are only two movies in the series. The last two are just mistakes in my opinion.
Nope. No fanboys here.
Because is it anti climatic.
That hardly answers the question adequately. You might as well said "because I said so".