I dont think there was this much deliberation. On the campaign's side you probably have people telling organizers to watch out for potential troublemakers, because they want a smooth event. A few layers below you have the people on the ground making the decision on which individual to let in and which to weed out and they aren't gonna deliberate much about the pro's and con's. They were told to watch out for potential troublemakers, they see a woman with a hijab, and they have to decide whether they want to risk someone protesting the president on live TV or have twitter mad because of the racial profiling.

And they'd rather have twitter mad over racism than have the president look bad on live TV.