When I took my girls out to Bonner on the Blackfoot to jump off the cliffs I had played on since I was a child, there was a steel cross drilled and permanently mounted on the highest platform on the rock. Apparently, a young man slipped and fell to his death there. So after thousands of us had successfully had a blast there for decades, the spot was closed to everybody by the bereived.
I feel for the family and friends but their reaction is misguided. So are all forms of worshipping the dead with permanent markers imo. Put some memorial on your mantle or someplace where you can see it regularly. But why subject other people, total strangers, to your greif.
I like the Tibetan custom of chopping up the corpse and feeding it to the buzzards to be "redistributed". Cremation comes closest in our society.