Top secret doesn't come by everyday, although as humans there are things that are best kept secret. Being Top secret means it is of utmost priority to be concealed. I have seen this in movies where Government agencies stamp a file Top secret, only to discover it contains dirty secrets the government are hiding from public eyes.
It's always kept secret if it is something unpleasant, I mean nobody wants his most kept secret be revealed to everyone, so concealment is their only option.
Truth be told, nothing lasts forever, nothing can be kept secret forever, it might take time but eventually it often comes to the light.
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