How has patriotic films evolved in tamil cinema?

South Indian film industry has been churning out films that instill patriotic spirit. But full fledged patriotic films are quite rare. Also, how it has evolved in the recent times is very interesting. The pre-independence films like Thayagabhoomi have talked about Patriotism along with socal evils like untouchability, dowry etc. The films in early years of post independence liked Veerapandiya Kattabomman and Kappalotiya Thamizhan worshiped Indian heroes who stood against the British. Then came films that revolved around Partition. In 1990s films about Terrorism started seeping in as in the case of Roja and Bombay. 2000s saw Biopics based on freedom fighters. In Today's films revolve around killing terrorists and saving nation. What do you think about this evolution?