I think the big problem is leaving the policing of this site up to the users. If you had fair and unbiased people getting rid of the rude and racist posts, I think the site would improve dramatically. I also think there really are a lot of Russian trolls on the politics section that have earned the status of "trusted member of the community".
I post a lot on the politics section. What has happened is that the place really has become a sewer (it always was to some extent). But innocent questions are reported and deleted by a """""trusted"""""" member of the community. Nasty questions often remain. But the trusted members of the community, I very strongly suspect, are just level 7 users that Yahoo personnel have in no way checked out, and that capriciously deletes questions that he or she doesn't like.
Yahoo needs to find fair and unbiased personnel to police the site themselves, instead of calling obvious trolls "trusted members of the community". I think that is the basic problem, the user reporting system. Also-- Let me re-emphasize: FAIR and UNBIASED Yahoo personnel.