Honestly the whole concept comes off as pretty ghoulish to me. Tourism trips to a mass open grave. Like going to Auschwitz for the hell of it and skipping the museum.
I get what you're saying, but I assume these people wanted to see the ship, and had little interest in the thought that people had died on it. As with going to any other wreck honestly, you go to see a cool ship at the bottom of the ocean, not in the hopes of seeing dead people.