Whey-hey, a new CT! Fantastic!!!
Unfortunately in an area I have zilch expertise in, having deliberately avoided any form of critical analysis of fiction since the throes of my SYS English at secondary school, back in the dim and distant days of 1986.
One might argue, for example, that the authors of these film scripts are responding to a very wide range of issues including societical views generally, marketing/public perception, and so on. One might also have to look at the demographics of the target audiences in order to determine patterns, and so on. Surely the study would also have to extend to other media, in particular TV, and consider comparisons within other cultural/policitical spheres?
There's probably a really interesting study in there somewhere. Why don't you try and put it together, Phil?