I mean, this question is not just about normal criminals.
Think like very bad crimes. Like serial killers, rapists, child rapists, terrorists, corrupt officials, terrible leaders, cruel dictators, generals that ignore laws of war, or like people has bad as Hitler. Which of these people do you think deserve a respectful burial, if any.
Is there a level of evilness that you think should not be allowed to have a proper buriel or have their corpses mutilated. Or should everyone deserve a respectful burial regardless of crimes.
I personally don’t even know how to answer this question myself. Like the funeral isn’t even for the dead. Its for the living. So to me, the question seems like, should the relatives of a bad person be allowed to see the corpse treated respectfully. I personally don’t have an answer to this question.
When they tossed the corpse of Osama Bin Laden into the sea, it wasn’t just because no country’s soil would take him, but to respect his religion, where in Islam cremation is considered a desecration. So they showed him the respect of a burial at sea, even though he was our enemy.
That one also has the aspect of avoiding a deliberate insult. Desecrate the corpse and you risk turning it into a Thing™ that people might rally around.
killing him does that too, but people rally a little less around a relatively restrained killing of a valid military target and unremarkable handling of the body.