I cant imagine either someone wanting to be deaf and trying find ways to self-inflict it. Now I can see someone who has friends who are d/Deaf that sign and they learn ASL to communicate and become aware of the culture, but usually there is some tie to the Deaf culture such as a close friend, family member, or relative who is d/Deaf.
As for people for it is painful to hear, I can see if it hinders everyday life, they might consider a surgery to take out the bothersome ear drum after it has been confirmed time and time again that it is not a recurring ear infection that is causing the pain or there is nothing blocking the ear canal.
As for someone needing pity - sounds like hypochondriac disorder. A mental illness that causes a person to believe they have many things wrong with their body and sometimes it is self-inflicted so they can get pity from others, or to gather insurance payouts.
As for deaf parents forcing their children to be deaf - that is borderline abuse and that is hard to prove in most cases since the child is otherwise being taken care of. The only way out for that child is to report mental/verbal abuse which requires many interviews by DCF authorities, counselors, and possible rehoming into a state foster care system which in most cases is as truamatic as the mental abuse and brainwashing they are going through. I think this something quite rare, but unfortunately, probably does happen.
As for can't standing to hear - there is a disorder out there where the body is hypersensitive to everything including sight, sound, and touch. They are often over-processed and are in constant overdrive mentally. In other words Over-stimulation disorder (I dont know what the exact medical term is for it). I read a story about a little girl who was 8 or 9 at the time and going through it. She would have meltdowns over the littlest stuff and it took years to figure out why. Now she has to go through daily physical therapy and medications and it will likely have to continue for the rest of her life.
Those are just some things to consider for your paper.
