I don't think it is a terrorist attack, because Malaysia is a Muslim country.
I'm hoping it was a terrorist attack!
The alternative means a modern maintained aircraft went down so quickly no one could call for help!
I think that for the families and countries involved, it would be better if it was a mechanical problem. It would eliminate any extra hatred for the family, and avoid future conflicts between countries.
You could also hope that it was a mechanical problems, because the alternative means that there's still so many ignorant stupid suicide brainwashed terrorists.