It is you who know nothing about SSI. Supplemental Security Income is NOT a Social Security funded program. They administer it but funds are taken from the government general fund. It is for those who haven’t worked and don’t qualify for Social Security. You are taking about SSDI Social Security Disability Income which IS a Social Security funded program under which have to qualify by working enough quarters. Go look it up. I did years ago on the SSA website.
Correction SSDI is Social Security Disability Insurance, not ‘income’ as I posted. SS and SSDI are based on insurance contributions through FICA when WORKING. SSI is not based on prior work. Last time I checked the SSA website, however, the SSI and SSDI payments to individuals amounted to more than 25% of total outlays by SSA.