In fairness the design was pretty much unsinkable in theory, the multi-compartment design was revolutionary in it's day, it's just on the ill fated day something went wrong (apart from hitting an iceberg lol).
It's worth noting that one of the Titanic's sister ships the Olympic survived a major collision and damage after an American cruiser collided with it, and became the first civilian ship in history to sink an enemy military vessel in combat during WW1 when it intentionally rammed a German submarine that was lining up to torpedo it.
Sorry but a little bit of knowledge and all that. Go read about the RMS Carmania and its battle with the SMS Cap Trafalger. Both were liners converted to cruisers for wartime duty.
The third ship in the class the Britannic sank during WW1 after hitting a mine (adding to the modern theories that the sub-spec construction materialsls
Many ships with massively more solid construction and water tight bulkheads were sunk by mines during ww1. A mine like a torpedo has massive destruction power so suggesting sub standard construction due to a mine is again a leap.