I think you mean "forgotten" :) As a former Titanic Enthusiast I will try to answer. When you look at the list of Wikipedia's Most Deadliest Maritime Disasters during Peacetime you get one quite modern, one explosion that took place in Canada during the hottest period of WWI and several ships carrying refugees in post WWII 40s China- hardly a peaceful time in Sinosphere, even if there was no official war involved.

Meanwhile Titanic happened during the heyday of Transatlantics where bigger, better, faster ships competed with each other. Olympic-class was ships were advertised as THE MOST luxurious of them and ads didn't lie- the second class of the Titanic enjoyed amenities available for first class on other ships and third class was basically a second class- in times, when third class passengers were often sharing a place on the floor eating own food Titanic offered separate cabins (for families and single women and men), table service and available. Letters send home from stops in France and Ireland show reactions of people who had been waited on for first time in their life. And while safety measures can seem laughably bad for us- it was a time, when safety standards were very lax and basically left to shipping companies.

So Titanic sinks. The news reached USA and Europe the following morning with press changing the layout midway of printing to add sensational news- firstly that she was badly damaged but still sailing, then that she sank, claiming life of thousands, some of them rich, famous and beautiful- first class was basically who is who of America.

When Carpathia reached USA survivors were chased by people from every form of mass media- press, radio and cinema. Next weeks were full of sensational, heartwarming and tragic stories- who are what will happen to Titanic Orphans? Ida Strauss refused to leave her husband! Astor bid farewell to his pregnant wife and along with Guggenheim met his death as true gentleman! White Star wants the families of the perished members band to reimburse for lost uniforms! Those brave honest working class fathers who run just in time to throw their babies to safety!

Newspapers didn'y let the topic die for months, printing interviews along elegies and other poems. The conspiracy theories appeared every day, some of them persisting even today.

Music wasn't far behind- from hymns and fundraising concerts, to vaudeville acts.

The first film documenting the disaster- Saved from the Titanic- starring survivor Dorothy Gibson and with re creation of sinking itself premiered just month after disaster. While the reviews were quite positive some writers wondered if they face a bland commercialisation of a tragedy. But the public loved the tragic story of young, pretty woman. German In Nacht und Eis followed quickly to similarly positive response. It was a short lived craze of maritime disaster silent films.

The morality angle just added fuel to the fire- Titanic become a stock theme of hubris for churches, communists and Nazis - yes, 1944 saw the release of German movie Titanic which convoluted production was a farce itself (the lead actress ran away from the set because director wanted the scenes in night to be shot during the night with bright lights- in the middle of airstrike wave) Then you have Night To Remember (book and movie) and periodical dramas involving Titanic as a backdrop. Titanic never left public eye because frankly he was too photogenic to sink and had a time when it stole all spotlight. TL; DR- it happened in the end of the peaceful Glided Age/Belle Epoque in English speaking world, claimed the lives of the rich and famous and media immediately picked it up.

See for more info

The Titanic Complex by John Wilson Foster

The Titanic in Print and on Screen Brian Anderson

Titanic Century: Media, Myth, and the Making of a Cultural Icon by Paul Heyer