stepford discrepancies

I just watched The Stepford Wives, hoping for a little light entertainment. I find that my light enertainment turns into anything but these days, and this proved to be no real exception. I admit that I am out of the mainstream, so to say, and would probably have not known that this movie had been made except for the fact that I have read the novel and watched the old movie, and the name consequently caught my eye over the summer.
The novel version of this movie is creepy but slow. The old movie is creepy and utterly terrifying in the final scene. The new movie is amusing and ends completely differently from the other two. If you ever want to watch or read the older versions and don't want to be surpirsed, don't read this post.
So, you probably know that this movie is based around the concept of a town of men who turn their wives into robots in order to make them perfect housewives. Both the novel (by Ira Levin) and the old movie take place kind of near the end of second wave feminism, and as such are bitter indictments of the reactions of men and women towards feminism, as well as a nice picture of stereotyping and such. In both of these versions, there is no happy ending. The women all become robots, the end. In the old movie, there is a particularly terrifying final scene where the real Joanna confronts the robot Joanna and realizes that the robot has these huge nipple-protruding breasts. I knew exactly what was going to happen (having read a movie synopsis) but was so freaked out that I had to turn on all the lights in my house and read something happy. (Although there was one awesomely funny short scene where Joanna tries to organize a feminist consciousness-raising meeting that turns into this bizarre slo-mo discussion of household cleaners...)
In the new movie, there is the obligatory happy ending, which was not so surprising in and of itself. I was, however, shocked to find the blame behind the robot women shifted from the main evil male character to his wife. What does it mean, that the older versions of this story saw fit to leave the male characters as the bad guys, while the contemporary version shifts the blame to a woman? That the bad guy is, in fact, a bad girl? I am somewhat creeped out by this. This probably didn't really demand a post of this length, but I really was shocked by the whole thing. What does this say about the consumerism of movie watchers? Did somebody somewhere decide that the male-negative ending of this movie was to harsh?
Up 'til that point, I thought this was actually a really funny movie. There are lots of little jokes that go by if you aren't watching, and maybe the overall humorous approach was the reason that they decided to make the ending different. I don't know. Anyway, that's way too much writing about this.