It's very clear - what you write makes perfect sense. And you're right, the guards are ridiculous, but somehow reassuring in a myopic way.
In large part, the amount of money and effort expended on preventing terror attacks or whatnot is a measure of denial. You could stop an army, but you can't stop every instance of a couple of crazy guys, particularly if they are willing to die. Similarly, you might stop or shortcircuit a massive assault on a university, but you can't anticipate all the sick individuals out there. The guards (like the DHS, etc.) are an assertion by action that we refuse to believe this - as if this faith in action makes something true.
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Cogito ergo spud -- I think, therefore I yam
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