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is it really any question that such a group exists?Yes, there are many questions.
Cultures emerge in any organization, and the U.S. government is known to be bureaucratic. But, acknowledging this is a far cry from sowing blanket distrust via facile allusions to some vague, vast, unseemly conspiracy that has still not been defined.
These charges side-step important questions, such as: who specifically are these people? How are they organized and who leads them? What are they actually doing? What are their objectives? And, most importantly, are their supposed aims and activities in contravention with stated U.S. interests? For instance, are they aiding adversaries, like Russia, to the detriment of U.S. policy/security?
It's reckless and irresponsible to lob these vague conspiratorial charges: "Systems! Control becomes more vague! Zeitgeist! Culture!".
Point to something tangible or it's all dangerous FUD and nonsense.
OTOH, the former president who manufactured the charges you're repeating, does so in an effort to undermine the U.S. government and justify supplanting it with a regime of his own making. And, that proposed regime's stated goals do directly contravene U.S. policy and democratic principles. The would-be regime is openly declaring that they'll replace the entire bureaucracy with loyalists, use the DOJ to prosecute opponents, etc.
And instead of being concerned about that, you have people mindlessly repeating, "Destroy the deep state!".
>its not appropriate to mock.
Needless to say, I disagree. It's as appropriate to mock as Flat Earth theory and anything else as equally non-substantive.