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CMV: America decided to vilify the concept of military parades because its own roads are too shitty to move armored vehicles
(hexbear.net)
I bet the Pentagon had a big bash planned and everything when their engineering corps brought them the bad news. Then they had to spin the sour grapes.
Source: Vibes 
It's because they love wars and the military. The only difference between them and chuds is that they act embarrassed about it. The reason they absolutely despise the parade is because acting bashful while committing mass murder is the thing that justifies it and makes it ok, in their eyes.