Why Would I Say "R.I.P" to an Unsaved Dead Person

I am not understanding the posts I see that honor unsaved movie stars who have died, with the saying "R.I.P." on the part of believers.

I can understand the unsaved who have many idols in their lives, but a born again believer doing this makes no sense at all.

I also understand believers watching shows for the story, but to elevate the actors in those shows as special merely because they were good at that profession, really defies reason for me.

If someone lived a Hollywood lifestyle, looking for fame and fortune through an acting career, chances are good they were not born again and ended up in hell. Why would we speak to them, the dead person and say "Rest in peace"?

There I go again, raining on someone's parade, they gloried in the enjoyment of the actors glow of a television show or movies they liked, because of their personal enjoyment of the movie or show, they judged this person as a good person worthy of praise even after death, knowing they were not born again, even acted in shows that devalued God.

Every movie star that I have researched, who acted in movies I have enjoyed, were proven to live selfish lives, many marriages, rebellious children and nothing of real value except amassing a fortune as their claim to fame.
Why on earth would I say R.I.P to an unsaved, wicked and immoral movie star that probably went to hell? Perhaps I am just slow, I just don't get it.

Are there so many who just don't think about what they are doing, but feel free to do things because they are tradition of the culture?