As I usually bring up in these Titanic threads,
The Steamship General Slocum, on fire off Long Island in 1904
Over a thousand Men, Women and Children burned or drowned, mostly from faulty or missing safety equipment
But they were mostly German Immigrants, so didn't rate like Rich people did as a PR tragedy
IMO the reality of the matter is that the vast majority of domestic disasters and tragedies just don’t interest people abroad unless there is some majorly glamorous or exceptional (biggest ever!) aspect to it. How many people in the US or Philippines have even heard of the MV Estonia? If it made the news it would have been for few days max. The Dona Paz is a fixture of the “worst ever” lists but unfortunately there is a major ferry tragedy every few years in Asia and they all blur together.
Or Dona Paz, in the Philippines in 1987. When it happens in the Third World, it's a non-event for the Western Media, and even less for the popular culture. Won't be seeing Jack and Rose. 4341 dead, 26 survivors.
As has been already described the Titanic had a whole bunch of exceptional factors that made it very very memorable long-term, in a way that run-of-the-mill “stupid stuff was done, masses of people died” just does not achieve.