Fandoms occur because of a rejection of Societal Control, this includes the boiling points of racism which infiltrate from within the subcultures or from opposinig subcultures. The Society is blamed because they adopt the standards expressed by what is acceptable granted by their national identity. Or what is legal, and what is percieved as legal by society are decisively agent to popular control. The fandom will simply express itself as a set, while society may change, fandoms typically do not have to.
The National aspect of sovereignty is what is ultimatley reduced to a meme in the front of the incurring civil disputes, but if the identity remains uncompromised and typically the fandoms do not outwardly attack the country's image then it generally remains in operation. The second it does it literally becomes a terrorist organization because it has attacked the country's sovereignty by attempting to overthrow it as a seperate faction.
Societies do this just as much as fandoms but are by and large a popular opinion and more of a management of that popular opinion, so fandoms are constantly disreputable depending on said opinions.
Until a Nation addresses either as being too extreme there will be nothing done to either's situation or presence. And that simply won't happen because any individual effort does not translate to a mass movement under a propoganda of weaponized memes or sloganeering and "reprogramming" of the Popular Opinion into Deep State Rebellion. (Joining forces basically to pronounce itself a sovereign state)