I'm not suggesting that this is any reason to support evil policies but I try to be sympathetic to struggles I may not be aware of.
What I'm trying to say is yeah, she could've taken the risk and stood up and said something. He could've beared the pain and sent the correct documentation. He knows the process by now, he had to have known exactly what he needed to send! And yet he chose to needlessly inflict harm on someone who's choice it wasn't theirs to make. The reality of jobs these days is not a give and take, let's all make the world better by democratizing our decisions type world. It's much much worse.
It doesn't matter what Karen thinks or wants. It doesn't matter if Karen believes the disabled person or not. It doesn't matter if Karen is physically capable of complex thought or not. If Karen breaks the rules for you, you will end up losing your benefits anyway, possibly forced to pay them back, and Karen loses her job.
Public sector employment pays terribly. People don't really do it because they enjoy it.
There is literal law all over that says "This information can't be in an email for privacy reasons". It's not policy, it's law.
Stop harassing low level bureaucrats and learn some damn civics.
Similarly, when I was a cashier in a grocery store, I had zero ability to refund you, to fix a problem, to bend any rule for example to help you with your WIC process, which was utterly miserable. Oh sorry the pamphlet this week says X bread is the only approved one, it doesn't matter that it causes your child GI distress, nobody is allowed to change it.
Vote for people who aren't trying to hurt disabled people and you will have fewer disabled people being hurt. Stop screeching about "Fraud" that doesn't exist if you want it to be easy for people to get the welfare they need.
All attempts to battle fraud will inherently add friction to the process. Find an optimization point that isn't so hostile to human beings.