Oomis,
Your mistake is assuming that yehareg ve’al yavor is because they are subject to capital punishment. The Gemara does not cite that as a reason. These are not cases of “matzilin oso benafsho”. There are issurei arayos that you clearly include that are not chiyuvei misa but you would include( incestuous acts) Most of the issurim read on Yom Kippur are chiyuvei kares, not misa.
And there are instance where you say yehareg even by clearly minor issues. Like by shas Hashmad.