From my point of view, “settled” does not mean the issue has been decisively proven or disproven. More often than not I see “settled” as meaning “nothing can be done about it”. Especially in terms of fraud and organized crime.
If you really dig into the 1960 election there are a ton of discrepancies and oddities that were investigated by partisan committees or had suspects end up having all charges against them dropped. In the 1948 Senate example, the SCOTUS case about the discrepancies was not taken up on jurisdiction grounds. So in that sense, no true ruling was ever made about the challenges in the case. But it is considered “settled” all the same.
>”In 1990, Robert Caro said, "People have been saying for 40 years, 'No one knows what really happened in that election,' and 'Everybody does it.' Neither of those statements is true. I don't think that this is the only election that was ever stolen, but there was never such brazen thievery." Caro said that Johnson was given the votes of "the dead, the halt, the missing and those who were unaware that an election was going on"
https://en.m.wikipedia.org/wiki/1948_United_States_Senate_el...