I don't think "simply trying to cater to a global market" could explain an abomination like V FOR VENDETTA. There is an element in Hollywood that's arrogant, hostile to Judeo-Christian values, and insensitive to the beliefs and desires of ordinary Americans.
That having been said, I have to agree with you on the issue at hand in this thread. Intellectual property is intellectual property. It can't be tampered with without the copyright owner's permission.
Apparently V for Vendetta was a highly successful comic book at some point. The movie, as I understand it, didn't do well. When you see these giant budget, action movies bomb you can usually trace it back to a property that did well in another format or copying the success of another movie. You can kind of hear the pitch meeting for V for Vendetta -- "Yeah, like Spiderman only edgy. Comics are hot and have a built in audience. Spiderman, Batman, all did major numbers."