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.
Ideally: No.
But i live in a materialistic society where status is expressed trough expensive houses/cars/brands and products.
If you buy a expensive gift (for a living person), you show to them that you are willing to go to great lengths to make them happy.
This is the societal norm in (probably) all western countries. And therefore, making a extravagant bureal for a horrific person implies approval for them and their actions.
So if you are not a materialistic person you can give a small burial to a person without disrespecting them, but there will definitely be some people that will then assume that you did not like that person. They will simply assume it without proof, as it is a custom, unless they know that you are a anti-materialistic person.