Reply #2: They tend more to reflect national mood and character

[ForrestGump]

Hence increasingly shallow properties that cater to the lowest of lowest common denominators and periodic bouts of excess jingoism. It's all about money. Well, mostly.

And you've got to be careful in failing to distinguish actors from the roles that they play, a very common tendency -- not all of these action heroes that you list are Republicans.

Hollywood really is liberal to a great extent, even if it doesn't always show as producers seek to maximize the bottom line.