Why is it more important to have an objective definition of deafness than it is to understand deaf people's definitions of deafness? The most important differe

Why is it more important to have an objective definition of deafness than it is to understand deaf people's definitions of deafness? The most important difference between deaf people and hearing people, for deaf people, isn't "5-4=1". I really hate it when objectiveness gets in the way of compassion and respect for human beings and life generally. Also, of course deaf people agree they cannot hear and have one fewer functioning sense. In some signed languages, the sign for deafness is an open hand, but with one of the fingers flexed (4 of 5). And I will argue in fact it's hearing people who get "emotional" about the idea that deaf people don't care about not hearing. By the way, "5-4=1" is not the most important difference for hearing people either. Hearing people will talk about hearing birds songs and stuff.