It was 50-60s decade. Due to our first prime minister Pt. Nehrujee's inclination towards communism, nation's most of people were talking in way of samanta (equality) by way of communism. From Raj Kapoor to Guru Dutt, film makers were making films under influence of communism. Communism also affected literature and other parts of art. Pessimism and frustration was shown in films.
After Nehrujee's demise, Indira Gandhi rose to power. System became so corrupted that on screen it gave birth to angry young man called Amitabh Bachchan. In parallel or art cinema too, Shyam Benegal, Govind Nihlani and others were making films in which poor or common man was hero.
But after P V Narsimha Rao together with his finance minister Dr. Manmohan Singh went on path of liberalisation, we saw more and and more films in which goody goody state of affairs shown. Film budget went high and high. So was business. Films were made keeping in mind NRI audiences (Karan Johar's films from K3G to Student of the year, Sajid Khan's films Housefull and its sequel). There was no idealism in films like Priyadarshan and David Dhavan's films. Ekta Kapoor and Ram Gopal Varma's films even glorified Dawood Ibrahim who is most wanted terrrorist. Mahesh Bhatt started trend of films with highly intimate scenes. There were very few unsuccessful and ineffective films like Laal Salaam and Summer 2007 which made on some ideology or having social concern.
Again around 2009 when UPA-2 came back in power scams and inflation were high, films made on police taking on piliticans like Wanted, Dabang, Singham, Buddha hoga tera baap. With Anna Hazare started jan lokpal movement we saw Satyagrah. Now with Jai ho will we see more and more films of Aam aadmi taking on corrupt system?