i think I actually kind of agree with you. now, part of the reason I feel suicidal is because I am aware of my disabilities and limitations and they make me feel useless. I think feeling useful is actually a valid need of most, if not all (human) beings. I actually want to work and be useful, but it is hard to tell what I am capable of except wording and expressing myself. I can walk, talk, see, hear and formally I even have a high school diploma and I EVEN ATTEMPTED university so I am probably not completely stupid or incapable. But my capacity to do things wildly fluctuates due to my executive dysfunction and burn out. I also suffer from skill regression. The kind of effort it takes to even get up every morning is gigantinormous, and I struggle to do basic chores most of the time. I am an awful worker.
It is not everybodies choice to be a "useless leech" on society, and the shame and the guilt that potentially comes with it can be a problem on its own. Plus like I said it can also be a need. I'd love to be useful, functional and reduce the overall suffering of humanity. But "God" gifted me with a torture chamber of a body that refuses to work even in the case of fulfilling my own needs, let alone that of others.
I am not very well versed in politics, but I have read that disabilities are often actually quite neglected even in political theory. Correct me if I am wrong.