I am an aromantic asexual. but i get aroused by seeing power dynamics (for example a parent hitting his child) but i don't like it at all. why i am having arousal? what should i do?

Find a life coach: life occasionally sends us challenges that we don't have the skillset needed to master. Your doc should know someone locally that can help you explore the origin of these feelings & learn how to get past them. They may be called a life coach or therapist. I expect there is/are events in your past that may be hidden to your memory that trigger these feelings. Do the work & life can be better.