It's also thought that Californian wouldn't have been able to get there in time to help anyway, since they were stuck in ice all night. The funny thing about the movie is that had Rose simply got into a lifeboat, which as a first class female passenger she would have done with no problems, Jack could have survived by sitting on that giant piece of wood until he was picked up.
Yep. Rose killed Jack.

On the Californian debate. The Californian marconi operator was trying to send out warnings of the ice but was being told to shut-up by the Bride the Titanic marconi operator.
What was Titanic's marconi operators send out?
The lavish and rich of Titanic were enjoying the ship so much they wanted to send messages out to the family what a great time they were having on the luxurious Titanic.
I believe, they even thought the distress flares coming from Titanic was a fireworks display being set-off to impress the rich/passengers.