Are you aware that the API appears to be publishing the SSN of each individual? Although I’m aware most SSNs are leaked in one breach or another, I still thought it was customary in the U.S. to attempt to keep such information somewhat protected.
That said, the _typical_ things an SSN is used for would not be terribly useful for someone that's been dead >2-4 years... Automated checks should flag e.g. credit applications as being for a dead person :-)
https://tracker.votingrightslab.org/issues/voter-list-mainte...
Broadly speaking, right to privacy evaporates at death, and when the Machine is working properly, SSNs have no value once they have been marked as deceased in SSA's system of record (as that flows through to various gov and commercial systems to ensure benefits cease and next of kin processes kick off for anything of value).