BillJ wrote:

Because no villain has ever been surrounded by armed guards in a film, ever. 
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To be fair, that image of Loki and the SHIELD guards was the first thing I thought of when I first saw that image of Harrison and the red shirts.
Mainly, it helped reinforce my theory, and indeed a very popular one that like Loki and the villain from Skyfall, Harrison allows himself to get captured as some convoluted part of his master plan.