Are you assuming this man came to the door saying "I'm a crack dealer running from the cops?" At the time he was let in there was likely no way of immediately knowing what his motives were. They then quickly assessed he did not belong there and he was removed from the facility.

Where is your proof and or evidence that the plan was bullshit?

So far you are just making emotional responses which is fine, just not very sensible and by your logic:

American Airlines fucked up by letting those passengers who they didn't know were terrorists on the plane and guess what? There was no plan once they had.

Harvard fucked up by allowing the unibomber to be a student there and participate in the class experiment that was responsible for his distrust and anger towards universities. Also Harvard had no plan for students who would act adversely to the experiment.

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Everything looks like Oprah kissing Harvey Weinstein these days