I don't know.
Perhaps it is result of differing views.
Some hold, perhaps most or about all, (I don't know), one accumulates good karma, perhaps grdually, perfect karma, and then ascends to a state that perhaps is so great it then produces...no karma.
I'd say this thing of karma as in Padmasambhava doing things which have known negative kamic effect it derives from other view.
karma produces certain spiritual effect of a greatly good kind but in the end it is still karma..derived from self.
If one holds the view that no karmic effect can be perfect however good and with the coin of good invariably comes the coin of bad.....ultimately when very close to realization or becoming realized....karma is a bit inconsequential.
Of course everyone includeing myself will then say...Oh....I am this great person I may now do everything It matters not.
We are of course not that special great person.
But for that special great person I could see how karmic effect of any sort good nor bad nor equal is but always equal.
Understanding devolving the self from which karma arises as apparence of self still exists in this realm at these times, so karma still appears in this realm at these times..but if no self being.....no self karma.
So for such a being the apparence of karma but not the actuality of it.
So what happens...maybe not so important in things.
This of course is not us nor about us... to t hink we are one such as padmasambhava is quite quite silly.
That may be how negatively karmically producing events may be utilized by one of such spiritual standing for means, without ultimate effect of the negative.
I respect the moderators valient attempts to keep this topic on point..
"This order considers that progress can be achieved more rapidly during a single month of self-transformation through terrifying conditions in rough terrain and in "the abode of harmful forces" than through meditating for a period of three years in towns and monasteries"....Takpo Tashi Namgyal.