Those two deltas were probably the only ones who were "in on the conspiracy". In other words they knew the goal was to kill the president. The rest of the team probably thought they were there to secure the area.But I don't think they guessed wrong about her, she just got lucky. Crazy they only sent in only two Deltas. President is in trouble and they don't storm the building? She got real lucky.
As far as everything else, they were right she would destroy military industrial complex and tip the scales of power away from the special interest.