Really?
Luke 22:36
But they said: Nothing. Then said he unto them: But now he that hath a purse, let him take it, and likewise a scrip: and he that hath not, let him sell his coat and buy a sword.
Trying to stay true to Augustine's error, the way your Church's catechism is worded prohibits capital punishment for all practical purposes. As long as someone can be guarded or incarcerated or isolated, the capital punishment is not an option.
Acts 5:1-11 1 But a certain man named Ananias, with Saphira his wife, sold a piece of land, 2 And by fraud kept back part of the price of the land, his wife being privy thereunto: and bringing a certain part of it, laid it at the feet of the apostles. 3 But Peter said: Ananias, why hath Satan tempted thy heart, that thou shouldst lie to the Holy Ghost and by fraud keep part of the price of the land? 4 Whilst it remained, did it not remain to thee? And after it was sold, was it not in thy power? Why hast thou conceived this thing in thy heart? Thou hast not lied to men, but to God. 5 And Ananias, hearing these words, fell down and gave up the ghost. And there came great fear upon all that heard it. 6 And the young men rising up, removed him, and carrying him out, buried him. 7 And it was about the space of three hours after, when his wife, not knowing what had happened, came in. 8 And Peter said to her: Tell me, woman, whether you sold the land for so much? And she said: Yea, for so much. 9 And Peter said unto her: Why have you agreed together to tempt the spirit of the Lord? Behold the feet of them who have buried thy husband are at the door: and they shall carry thee out, 10 Immediately, she fell down before his feet and gave up the ghost. And the young men coming in found her dead: and carried her out and buried her by her husband. 11 And there came great fear upon the whole church and upon all that heard these things.
I am glad to see your Protestant Random Cherry-Picking Verse Generator (aka PRCPVG) is working properly, but you need to turn on the Rational Context-Interpreter (RCI) as well (and don't bother with Protestant model—they have a programming bug).
In the meantime, you may wish to use the God-given faculty of reason and ask yourself What did Jesus tell them to do with the sword? Execute people? Please don't embarrass yourself like this. But since you seem to insist, you may also remind yourself that when Peter used his dagger, Jesus told him to put it away.
Acts 5:1-11...Thou hast not lied to men, but to God. 5 And Ananias, hearing these words, fell down and gave up the ghost.[Peter speaking]...And Peter said unto her: Why have you agreed together to tempt the spirit of the Lord? Behold the feet of them who have buried thy husband are at the door: and they shall carry thee out, [i]mmediately, she fell down before his feet and gave up the ghost..."
If you consult the logic department in your God-given computer situated in your head, you will soon recognize that the "execution" in this case was done by God and not by Peter, because, as the scriputres remind us, vengeance belongs to God, not man, and not the Church.