It appears the Titanic split into and did not implode.
Maybe on the way down with lots of places for the water to go, the pieces of the ship equalized ?
Why water tight door were not closed may have been the “ ego “ of the captain.
It is claimed the ship left port with an active fire in the coal storage which if true is like plane taking off with a fire burning away in the luggage compartment.
Again the “ ego “ the Captain.
Well, I don’t think the “ ego” of Captain Smith is really a factor... I think hubris is more appropriate- He was very respected, long serving, very experienced and highly regarded - in fact certain passengers would only travel on White Star liners as long as He was in command...but of course, all those attributes compared to the standards of today may well of been found wanting- and he had had collisions in His career. Also consider the very rigid command structure of the day, and the ability or lack of questioning a superior Officers orders.
Therefore we have to see them in their time and context.
As for the coal bunker fire, it was a fairly common occurrence, due to the huge amounts of coal dust and not unusual in ships of that time; this is regarded as a major factor in the sinking of the Lusitania, igniting and then exploding coal dust after the torpedo strike, contributing very much to Her rapid sinking.
Also the “ water tight” doors were only effective up to a point - Titanic did not have a fully compartmentalised structure up to Her deck which allowed the incoming water to overflow and flood each successive compartment in turn; and whilst She could stay afloat a lot longer or possibly for good with 4 compartments flooded, She had been split across 5 and Her fate was sealed.
Water tight doors were often left open- even in Royal Navy warships, when not at action stations- because they hampered movement, so again, maybe bad practice but not ego.
Hubris, combined with a whole series of small mistakes, mishaps, a bit of sloppiness, failure to communicate effectively and yes maybe the false confidence of security of the sheer size of these ships, provided a nexus for disaster...
Sorry went a bit off point there- my apologies.