No need to apologize for disagreeing. This could be a fun debate! I look forward to its continuation!
As for descendants, even the likelihood of children is unlikely. I'm sure there might be a few, and for them I might be able to concede something like that could be in bad taste, assuming it's even supposed to be the Titanic. But any person who could have actually had a direct connection to anybody in the tragedy has to be at least 100 years old. Anyone who would actually have any memory of that person would have to be at least a few years older than, probably several years older. That number has to be pretty slim, if existent at all. Any other descendent further removed than that... well, I'm sorry, but there's no personal connection, no memories, no tangible emotion to offend. Now if someone was directly mocking a person involved in the tragedy, then I could see the family taking offense. But to be offended by the use of a tragedy that has no connection to them other than the coincidence of blood ties but no personal connection, well, I don't see any cause for it.
If we were jumped forward to a future in a hundred years where people don't take 9/11 seriously, I could see people from now being offended. I wouldn't personally be offended, as I feel that healing has to happen eventually, and that people with no personal connection to the event would have no reason to view it as anything other than some distant tragedy. I would, however, probably not have any taste for it. And that's my point. We were alive to experience the tragedy. We remember it. It has directly affected our lives. We have a personal stake in it. People who are getting offended by a toy sinking boat have no personal stake. Taking us out of our own time is something of a cheat unless we're worried about time travelers from the early 20th century coming here and being offended. And even then... well, that's what they get for assuming their tragedy is the center of the universe in all time periods. Might sound callous, but history marches on. Otherwise people wouldn't be entertained by war re-enactments.