I think the issue people have isn't so much with the principle of the thing as with Flavius' cocky self-righteous attitude ... and his bombastic condemnation, as if he himself were without sin.  I can see the guy being one of the potential stone throwers to whom Our Lord insisted that the one who is without sin should cast the first stone.  Flavius would have jumped to the front of the line, since he obviously imagines himself to be above the sinner, and looks down on them through his nose.  Were it not for the grace of God, so would we all go.

Some people (like the Pharisees condemned by Our Lord) condemn the sinner primarily in order to make themselves feel superior to them.  Even if it were required in justice, any true Christian would only execute such a one with the heaviest heart ... whereas one can easily imagine Flavius dancing for joy as he pulled the switch personally.  Notice how Our Lord had compassion on those who sinned from weakness ... but reserved His harshest condemnations for the Pharisees and their self-righteousness.  I would rather spent my time in the company of a contrite fallen adulterer than someone like Flabius.

Compared to Richard Ibranyi who threatens to kill others (including Bishop Fellay) in his lectures and issues ecclesiastical penances, what I am doing is relatively minor. All I am pointing out is the penalty for a certain crime and suggesting that it would be a good thing if it were carried out.

Well, that's like saying if I murder a single person, then it's relatively minor compared to the work of a serial killer.  In any case, I have no problem with someone making the case that the death penalty should be instituted for adultery, in principle, even though I disagree with it for the reasons stated.  It's that I have found your tone to be very disturbing.  Yes, we know that adultery is a grave sin.  But can you find no room in your heart to have compassion to someone who may have sinned out of weakness?  

Do you reject Our Lord's compassionate rescue of the adultress as inappropriate?  Don't you think that He was speaking precisely to people of your mindset when he said that the one without sin should cast the first stone?  In strict, justice, man, every mortal sin deserves the death penalty ... and not just adultery.  But then we'd have to wipe out all but the smallest fraction of humanity.

There should be no debate on this issue if you agree in principle that adulterers should be given capital punishment. My eager attitude should be irrelevant to the discussion.

I hate those who would commit such an act while understanding the total wickedness and evil of it. I have no compassion for those with such a hatred of the Lord in their blackened hearts. I rejoice in knowing that they will receive what they deserve both in this life and the next.

I hate those who would commit such an act while understanding the total wickedness and evil of it. I have no compassion for those with such a hatred of the Lord in their blackened hearts. I rejoice in knowing that they will receive what they deserve both in this life and the next.

Have I not hated them, O Lord, that hated thee? And pine away because of thy enemies? I have hated them with a perfect hatred, and they are become enemies to me. (Psalm cxxxviii)

Why is a "subhuman incel", in his own words, so obsessed with adultery? You've already said you're never getting married.