[Avodah] Question

[Cantor Wolberg]

Has anyone ever asked why regarding the sin of the
eitz hadaas, the punishments meted out to Chava and
Adam were transmitted to all of mankind, whereas,
when Kayin murdered Hevel, only he was punished.
It seem strange that the sin of the eitz hadaas had much
more encompassing consequences for all of mankind,
but the consequence for murder was restricted just to
the perpetrator.