Perhaps not a conspiracy, but doesn't it say something about our culture that we find it more interesting?

Yeah, this comparison is getting really strained. As the Joker once said:

Nobody panics when things go “according to plan.” Even if the plan is horrifying! If, tomorrow, I tell the press that, like, a gang banger will get shot, or a truckload of soldiers will be blown up, nobody panics, because it’s all “part of the plan.” But when I say that one little old mayor will die, well then everyone loses their minds!

A sunken ship filled with hundreds of migrants in the Mediterranean is, horrifyingly, a routine thing. It's "part of the plan." But a billionaire in a minisub possibly stranded on the Titanic? That's newsworthy. Yes, it sucks, but it's human nature and some battles are just impossible to win under the current circumstances.

The main difference is that the Pylos tragedy forces us to confront heavy issues that are politically fraught. Oceangate doesn't have the same context. Even though most of us are more likely to be closer to the people on that ship than the billionaires on the sub, it's easier to digest the Oceangate story. Maybe because of the distance, it seems like more of a plot of a film, whereas the boat incident is a humanitarian disaster.