Badlapur was a movie where the lines between the hero and the villain get blurred more and more as the movie progresses.
It starts with Raghu (Varun Dhawan) being shown as a victim of Liak's (Nawazuddin Siddiqui) acts. Liak kills Raghu's wife and kid, and like any guy, he too wanted to see him get punished, and also like any other human, he also thinks that punishing him would make him get peace and closure.
Although that never happens. Revenge never gives you a closure or brings you at peace. But it's easy to say this when it's not you who has faced injustice. It's more difficult to forgive and forget than take revenge, especially when the person in front of you isn't even feeling guilty for his acts.
Taking revenge from the person who wronged you does give you a strong satisfaction, but that satisfaction is temporary, and in the process of taking revenge, most of the time people forget their own humanity.
This also happened with Raghu in the movie. He could never move on from the death of his wife and kid. Because he thought that the guy who killed them is not Liak but someone who is still out there. He wasted 15 years in the thirst of revenge and when finally he thought he got it, he didn't really feel anything.
In the end, Liak takes the blame of killing his friend and his wife who were actually killed by Raghu. He gave a second chance to Raghu to live his life, and he was the same guy who destroyed his life.
So the movie ends with Liak and Raghu's roles being reversed, with Liak being portrayed as the hero while Raghu being the villain. But did Liak really became the hero in the end? Your good deeds are never going to make up for your bad deeds.
What you did in the past, you can never change that, and sometimes the ghosts of your past don't leave you in the present either. Liak destroyed Raghu's life. Why should we expect Raghu to move on from that? How can he even really move on from that?
So in the end, which character do you think was "more right" or "less wrong"? Liak or Raghu?
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