If I'm honest it's the films like the Saw series that worry me, historical facts get changed and twisted every day and if a film distorts or maligns people like soldiers at least they can get up and protest that the film is wrong. What worried me is the insidious pushing of boundaries where violence is concerned. I don't think this is political or even done by people with a political agenda, it's done purely to get jaded people who have become used to violence into cinemas. This to me is far worse than anyone trying to use cinema for propaganda purposes.
If someone makes a film presenting a politician for example in a certain light, good or bad at least people can discuss it, refute it or make a film with an opposing view. Films with extremes of violence however are marketed as entertainment and it becomes accepted that it's normal to watch scenes of torture, we become hardened then to scenes of real violence in warzones, on the street etc. We become desensitised and less compassionate, we become worse people not better. Politics in the cinema can make us angry or amuse us or we can ignore it altogether, it does far less harm in the long run.