The first question to ask is to which people are dangerous people dangerous? In most instance its to the government and its toadies. From Eric Peters at theburningplatform.com:

You’ve likely been following the suppression of speech by the big tech companies and may have noticed collusion – the real thing, unlike the asserted thing directed at the Orange Man.
The suppression is coordinated and even deploys the same verbiage against its targets. For example, Paul Joseph Watson has just been deleted from Gesichterbuch and labeled – here it comes – “dangerous.”
Just as I have been.
It’s unlikely this is coincidental.
And as in my case, what makes Paul “dangerous,” exactly, is never specified. That would enable him to at least respond, to defend himself and – what cannot be allowed – refute the charge.
Instead, a vague blanket indictment. Which is purposefully intended to be impossible to directly challenge.
The Jews are Our Misfortune.
Anyone remember that one?
It amounts to the same thing, in principle. People anathematized for no specific reason but just because they’re not liked.
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Dangerous people are those with little or no integrity.