The towers are in Kuala Lumpur. Why wouldn’t they have plowed into them after they took over the plane and made their U-turn back across Malaysia?
Something on the flightdeck caused their plan to go awry. Besides in the middle of the night there is not enough people in there for large numbers of dead. IMHO they want to top 9/11 for a death toll. That would be easy on a typical work day there.
This is just my gut thoughts.