Why be shocked, the possibility was raised the day the plane was lost. It’s a speculation now, just as it was then.
Because, at the time, with obama in office, the reports and “smart people” were adamanat that there was in no way a possibility that terrorism was involved because there was no evidence of such. The plane just dropped off the radar, changed course and stopped responding to air traffic controllers and... just disappeared.
Absolutely not terrorism... until now.