If one morning you went to work to a beautiful tall building that your fellow countrymen had built and suddenly you found that you had to jump to your death out of the window because the alternative would be to die in an unbearable heat, choking from terrible fumes--wouldn't you pretty much feel that your dignity had been "touched" ?
Well, in case you haven't been following the news, not long ago there were thousands of people who felt just that way, or very similarly, and tens of thousands of people who lost a loved one that way. The person your courts are trying knew full well that his actions would lead to such an outcome--he could fully grasp the extent to which he would "touch" human dignity--yet decided to go ahead with it.
Can you fathom the depravity of a soul that would make such a decision?
Now, I ask you, if you actually believe that human dignity should be untouchable--if you have really adopted that principle as a law above all laws--what, then, should happen to a person who so blatantly disregards it? Shouldn't the most important law be the law that is the most unforgivingly enforced? If a person utterly fails to respect all human dignity--including his own dignity--doesn't that make him a criminal of the greatest degree according to the first article of your constitution? Why in the world would should a respect for his "dignity" keep you from punishing him, once he himself has wilfully and forcefully thrown his dignity away?
You speak of values. Do you value something by letting those who don't care about it destroy it? You quote the Sermon on the Mount. Do you hallow your pearls by casting them before swine? You invoke your constitution. Just what, I ask you, is your constitution worth if it prevents its own enforcement?
Thanks for the ping, Polybius. And you're right: The word for his mindset is indeed irrationality.