I normally stay out of these, but seriously? The pp you quoted did not complain about a "CHILD" needing a flashlight, but someone NOT being concerned about other people. There are many solutions to helping PEOPLE that are afraid of the dark. Maybe in trying to find a solution, there is one that is not as likely to be an infringement on other people.
Example of picture taking: I have been known on some dark rides to take pictures, but I turn off my flash since the flash distorts the pictures and I only use my view finder and not the back of the camera. I also do this when my moving around is not as likely to interfear with others view of the attraction. Sometimes this is requesting the last row of a ride or being in an individual car type ride.
Example of helping with fear of dark places: Let the person with the fear know there is a flashlight in a bag if it is needed if the ride stops or all the lights go out. Then for the ride, use glow-in-the-dark items or smaller items that have a light that does not actully shine far, such as a pen light that individuals use for close up work. Most people I know, children included, that have a fear of dark, just cannot handle pitch dark and being in a darker place just increases that fear.
