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Any free-to-access community requires some kind of moderation for normal operation. Conspiracies and intentions of community-disrupting actions actually don't matter - it doesn't matter if spammer spams for fun (these people exist) or doing it for specific purpose. If some place without moderation exists peacefully, it is only because some crazy person with much free time didn't discover this place. World is evil and bad place, so any community must have means to protect itself.
Although if you really want true free speech, you must not complain even if content is bad for you (morally, legally etc). But most of people don't want this, they want topical discussion. Personally, I don't care about any (really) content at all, but I imagine that there are people who care much more.
Considering Kohl (and imageboards as general) - imageboards aren't profitable business and owners typically do it because they just want it, so they may or may not listen to opinion of users. What to do? I don't know, amass users, ask moderators to do something, and if they wouldn't... hmm, maybe make own imageboard where leadership team represents values of community more than on kohl (preferably they need to be main part of community).