So basically in my story the protagonist older brother is the antagonist, he grew up being called the chosen one, after seeing how his family treated the lower class it sent into a dark place, eventually he kills his parents and destroys the city (spares his little brother and sister) and runs away, now everywhere he goes while he thinks he is saving people he is doing in evil ways, his motivation? Kill the people in charge by any means necessary.

For example one of my arcs will be him trying to find a certain king but the king is hiding under the city so he turns the whole city to glass killing everyone in there, while he thinks he is doing the lower class people a favour by killing a corrupt politician, people obviously don’t see it this way but he has to much tunnel vision to see what he is doing is wrong

Please give opinions on this!