Well, I fell compelled to say some things, as I have several relatives from Phuket, and my mom is there right now, working at one of the hospitals...
First off, incredibly pessimistic statement. The confirmed death count has risen from under 10,000 to around 60,000 in three days. It's only gonna be somewhat accurate after a month,and that is realistically a maybe
Secondly, about why tsunami warnings weren't given: there's no systems or organizations for this kind of thing, as it has never happened to this part of the world before, in recorded history, IIRC. Some people will criticize this, but that criticism is not fair, because there is not really any way to warn people of something this disastrous and devastating effectively. The credibility of such a statement would also be quite questionable, due to the above reasons.
I'm sorry if I've come across as harsh, or perhaps offensive, but I've been honest. This event has quite greatly affected my life the past couple of days, and especially that of my brother. As for the disaster itself, I'm at a complete loss of words. There is nothing I could say that would come close to what I feel right now.