Bottom line. Nader was a spoiler. And it could happen in any tight state with RFKjr.
Nader may have sincerely believed both parties were rotten and didn’t care which one he hurt. Unlike Perot who clearly had it in for George Bush and wanted him to lose in 1992. Whether RFK Jr. would hurt Biden or Trump more is uncertain (my guess is Biden which is why the Democrats are treating him shabbily).