Answer:
Tarak Mehta ka ooltah chashma
The theme highlighted in the mentioned excerpt would be perseverance.
The excerpt tells of Rainsford's courageous act of braving the sea to go to the direction of the shots despite of the harsh conditions at the sea. This is evidenced by the phrase "he fought the sea".
The term "doggedly" also describes a persistent pursuit which was what Rainsford showed. He showed perseverance in his actions.
These individuals are fighting because they have conflicting ideas. One side believes that white people are superior to every other race, while the other believes all races are equal, and not one is better than the other.
It is because of this strong disagreement that these people are at each other's throats. Add in an immense passion for your beliefs, and that can spark violence.
Hopefully, this helps! =)