Maybe you should let people grieve how they want to and try not to be so judgemental.
It’s such a personal thing that as much as I personally have no view of tattoos in real life - it’ll be hard for me to judge someone who wanted to preserve a part of their lives - however they wish to do it.
The Toraja people of Sulawesi unearth their deceased family once a year to clean them, talk to them etc. Some keep their dead for years even after they die because they are not ready to let go. Is that morbid and grim as well OP? To you yes, to them. It’s life.