Generally right 

You write "If white racists were to start editing articles about black people, they'd be banned immediately by admins or the community." I generally agree with the rest of your points, but I think that Wikipedia has demonstrated that "racial realists," will be given a great deal of room before being banned by ArbCom along with the people that tried to stop them - for example - Wikipedia:Arbitration/Requests/Case/Race_and_intelligence.