What is the derivation of RIP? Does it stem from a diehard tradition from back in the day when newspage space was at a premium and obituary typesetters were always looking to save a little time?

Maybe so, or maybe there’s a better reason but in this online day and age, why after a deceased’s name do people drop “RIP” into the headlines or taglines of otherwise considerate and thoughtful online eulogies without realizing how cheap and lazy and hard and cold it looks?

Just wondering.