Damn, the culture they have bred and actively maintained is now going to be turned against them?

It might end up making them more sympathetic people on the long term. They might realise the seriousness of what they have done to others.

"The culture" of 4chan varies from board to board and even thread to thread.

the serious crime of... deleting egregious posts from a website

You don't like to lump people into groups by race/country of origin but find no cognitive dissonance in lumping people together by platform choice.

Yes.

People can leave the platform. They can't leave their race.

That's just the view of bureaucratic machines which prefer to have some stable identifier in the relevant field on paper form (it doesn't matter if it's for ethnic cleansing or “celebrating diversity”), and then shape the reality until it fits.

Even though it might be hard to ignore the well-budgeted choir of well-intentioned promoters of status quo, you still don't have to believe in this concept.

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One of those is something people are born into without choice. The other is chosen because of their tastes.

"Wow, you'd group people by their actions and beliefs but not by immutable characteristics they were born with?!" /s

While a precise estimate is difficult to gauge it is supposed by professional analysts that a majority of hacks are state sponsored.

If the hacker is a state actor then I don't think anyone has learned anything about Free Speech.