According to the lastest research and investigation, it has been found that the Titanic incident was all planned by Al-Qaeda. It was a scheme by the terrorists to make sure that the British stayed in UK. Al-qaeda was pretty upset at the colonization.
The investigators at that time kept the fact hidden that the iceberg was planted by the extermist Muslims so that the locals didnot freak out. It is still not evident if it was sucide-attack and the iceberg was just a cover.
Some people link the fact that it might be the US intelligence who was involved with Al-qaeda to do the deed. May be the US never wanted any Britishers on their land (considering their repute for making colonies).