The why can be expressed in one word, discouragement.
Going by my exprience people like me don’t handle discouragement well. Put up a barrier and I have problems. Bad equipment is a barrier, snotty attitudes are a barrier, lack of funding is a barrier. And people like me are not really equipped to deal with barriers and discouragement.
Then you have social workers who have no understanding of what you’re going through. A young man for instance who insists that your autism can’t be a problem because he is incapable of understanding how it could be a problem.
Folks, don’t discourage, encourage, it aint gonna kill you. The more people succeed at a beneficial task the better the world is going to be, and the better your world is going to be. Remember that the success of others in a task that brings benefits is no threat to you.