Audis, doctors, speech therapists, and teachers do it all the time, and they don't have any of the above either.
Then there are those, as well, who have just begun their journey and have so much left to learn as their child grows, yet seem to think that they know enough, over a few years and limited experience, to express an opinion for the deaf.
OB has a great deal of empathy, and has taken the time to contrast and compare the issues. She has a good understanding of the issues and their consequences. I, personally, admire her for taking the time to educate herself and to be open to all information before forming an opinion. And to continue to be open to the deaf perspective by paying attention to what the deaf have to tell her regarding their experiences.
People sometimes care because it is the right thing to do, and not because they have a vested interest in the situation.