Another Reason Not to Torture

I am not Catholic, but I was thinking tonight about the Catholic position on murder (spurred in part by Bruce's post on ethics). As I understand it, the great sin of murder is not that you kill someone, but that you cause yourself to become a murderer. The greatest harm, then, is done not to the dead man, but to yourself. The victim has gone on to his reward (we'll assume), while you have committed a hideous sin. (And if any Catholics are reading this and think I'm presenting Catholic doctrine incorrectly, please let me know.)

So, following that line of thinking, could we say that the greatest harm in torture is to the person who does the torturing? It is horrible to be a victim, but torture destroys the body, not the soul. To be a person who willfully inflicts pain on other people, however, corrodes one's own soul, which is a more grievous sin.

I'm just tossing this out there for discussion--what do you think?