Imagine you have an E student, 16 years old. You have major anxiety over the thought of supporting them for the remainder of your life as it seems unlikely they'll ever be able to able to hold a job/achieve financial independence. Disability can be your ticket and parents hire what's know in the industry as advocates who you guessed it advocate for their student to be labeled and receive support for having a disability. I can tell you it's a surefire way to ensure your child receives passing grades w/ out doing anything at all b/c you can relabel the lack of effort as due to their disability.
It's akin to drug addicts learning the in's and out's of the hospital system to receive pain medications. Pain has a lot of wiggle room and ppl will milk it just they like do disabilities.