Maybe Majiks don't understand death all that well? If a Majik is still there, then it's alive. They can reform anyway. If a human is still there, even if "controlled," then...
I don't know.
well, maybe it's these human hater majiks in particular, not just human haters but extremists that have refused to even see humans. Sucks to suck, he really does not know or understand human emotions or connections.
If Desscaras had succumbed to seeing her brother's corpse, I bet he would have gloated how weak and misguided humans were to their emotional minds or something, but since Desscaras took down the corpses included her brother's, he tried to gloat about how human love and connections are fake because she did it.
Hitsugi is a hypocrite indeed, he is a blindsided extremist that does mental gymnastics in order to keep his worldview, his ideology is based on fragile logic that needs excuses for each outcome to preserve itself and not fall apart.