Of course I may be proven wrong, but I feel that it is quite premature to make such an assumption. A plane can rapidly disappear from radar for a number of reasons: not including your suggestions of terrorism or explosive payload.
The thrust of my comment was that the data indicates a very rapid breakup of the plane (explosion), and I indeed said that there are other possible causes of mid-air explosions besides terrorism. My mention of explosive cargo wasn't intended to be an exhaustive list of alternative causes. I just think that terrorism is certainly within the realm of possibility given the totality of the circumstances.