SSI is a real rip-off and I see no candidate willing to take it on. It is probably one of the reasons SS is in big trouble.
Not only do people get it for amorphous long-term emotional ailments (I met a woman once who got it because she said working gave her migraines) and mild and vaguely defined “handicaps” such as ADD, but long-term alcoholics and drug users can also collect it as persons with a “chronic illness.”
Don’t forget all their kiddies probably qualify with ADHD or some such nonsense. $700.00-ish per month per child results in a nice little income.