Ok, I will attempt to spell this out for you as clearly as I can. You will have to trust me when I say that however it comes across, I mean no disrespect. I mean no disrespect when I say - you are interpreting the whole thing with the severely tilted bias of sedevacantists, as I will attempt to demonstrate. You might need to read it through a few times..........
Clearly there is nothing that would stop a conclave from electing a heretic as pope. It is an absolute fact that we've seen this happen several times since the Council.
You are correct and I agree it has in fact happened. There is nothing to stop the cardinals from electing a heretic pope or only a terrible pope - or a saintly pope for that matter. The decision rests entirely upon the cardinals - albeit presumably with the hope that with the help of divine intervention, a saintly pope gets elected.
Now for the conundrum......
But it is also an absolute fact that Catholic doctrine rejects the election of any manifest heretic to the papacy.
Now you just said above that there's nothing to stop a conclave from electing a heretic as pope and you also correctly said that it is an absolute fact that it's happened many times since the Council.
If what you are saying now is true, namely, that doctrine rejects a heretic to the papacy, then Pope St. Pius X and Pope Pius XII are either 1) guilty of a colossal blunder, 2) or they blatantly reject Catholic doctrine, or 3) they are aiming to destroy it by mandating the suppression of any censure specifically for the election - are they not?
Worse yet for SVs, after the election, 4) the law mandates that the censure goes back into force - this is the law that the popes made.
Which means when a heretic cardinal is elected pope, per papal law, he is back to being a heretic instantly once elected. Should such a thing happen - and as you have correctly said, it *has* happened, then this result can actually be attributed directly to the papal law of PPX and PPXII.
Yet you also seem to say that canon law overrides the direct papal laws of PPX and PPXII? - But isn't it true that the laws decreed directly from popes supersede, override, cancel out and are above any canon law?
I am quite sure you have zero doubts that PPX and PPXII were true popes, as such, the law they mandated for papal elections is infallible, if not infallible, it is nearly infallible.
So now your conundrum is - how could true popes ever risk electing a heretic to the Chair by making it a law to invite heretical cardinals to participate in the papal election, and also mandate that after the election their censure goes back into force? Which is to say the papal law guarantees that if a heretical cardinal gets elected, after the election, ipso facto, the heretical cardinal-now-pope is now a heretical pope, and is so via papal mandate.
I believe this an accurate conundrum, a conundrum created by sedevacantist thinking. Before continuing, please let me know if this conundrum is accurate.