I'm currently writing a sort of serious superhero thriller. The main character finds out his father is a kingpin and drug lord. At the beginning of the story the main character, who has been living in a bubble his entire life, witnesses a cold-blooded murder during a mugging. In the draft that I have right now, the people killed were strangers. This event weighed so heavily on the main character, who is the paragon type, that when he finds out his father is in control of the city's underworld, he becomes bent on stopping his own father.
Does that sound like a good enough motivation? Or do you think I would have to give the character more of a reason to fight his own father? I was thinking maybe adding a another character, like a friend or a brother, who gets killed in the mugging but I felt that would be jumping the shark or even a bit Batmanish or Spidermanish if you know what I mean? What do you think? Also, I want to add that even though some characters have superpowers in this world, I want it to be somehow grounded on reality.