1)The modern KKK has 5000-8000 people by most estimates as of the modern day.
They are not the cultural movements they were in the US before the 1960s and 1970s; even the racists have largely moved on to other forms of organization. They are still there.
2) They are unjust incarceration; the motive is irrelevant for our purposes.
Forced prison labor is very much a thing in the US; the ACLU makes it clear that 76% of prisoners are forced to, on pain of consequences like solitary confinement, denial of parole and visitation rights.
We examined the injustices of prison labor nationwide — and lay the foundation for a more equitable path forward.
www.aclu.org
Unjust imprisonment is unjust imprisonment. Just like how in the United States you have people whose lives were destroyed for marijuana possession, or possession of enough drugs for personal use, or who ended up in jail because
someone's private prison was paying kickbacks to the judge to get children sent to his prison.
Dont mistake the fact that the US isnt doing political prisoners any more for the idea that large sections of the criminal code, or its implementation, is actually just. The fact that you're fucked because the prosecutor is looking to pad his numbers for reelection, or to placate a demographic, doesnt make you any better off than the person targeted by national political policy.
3)We have zero control about the second and third order consequences of sabotaging organizations.
A prison for example, as has been suggested, could start having trouble processing inmates
It might also simply poison its inhabitants due to its food handling procedures no longer working. Or release a bunch of hardened criminals along with political prisoners.
This is a blunt instrument that you are talking about.
4)No, the KKK is not something I have any interest in engaging, because it verges too much on RL politics and certain major stakeholders of the US political system. I would rather keep complex sociopolitical issues out of my escapist fantasy quest, rather than pretend that all I have to do is cast a spell to make them go away.
These are not issues to be solved by magic.
In 2000, McCain lost the Republican presidential nomination to George W Bush in part because of a whisper campaign by Bush supporters
that his adopted Bangladeshi daughter was the result of his having an affair with a black woman. And in 2008, the election of Obama ignited an eight year campaign of racist smears at himself, his wife and children.
Pretending that the deepseated racism issues of large sections of the United States are something to solve by targeting marginal organizations with magic spells does injustice to a serious issue.