Like try learning the story of rabba shechting Rav Zeira on Purim one year,
reviving him the next day through davening, and then not only NOT doing
teshuva for slaughtering someone, but cheerfully offering to do it again
the next year.
His host offered to eat again together the next year, not to slaughter
him again. Also, some interpret the wording to mean that Rav Zeira
was forced to drink too much wine (as opposed to having his throat slit).
As for doing teshuvah, serious intoxication was involved – perhaps
things done only due to such a state do not require teshuvah.