Despite multiple inquiries - the Senate in the US and the British Wreck Commission - and hundreds of witnesses examined, ultimately, the disaster was essentially declared an act of god. While regulations about the number of lifeboats changed, the White Star Line had met the minimum requirements of the law. While Captain Smith did not take enough heed of ice warnings, or the loading of the boats was chaotic, etc, etc, in the end... nobody. Nobody was held responsible.

If you are curious about the aftermath of the Titanic disaster, or how society reacted to it, I strongly recommend Steven Biel's "Down with the Old Canoe" - it's a solid read.