"If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind."
~John Stuart Mill~
If you're talking about the FC rules, then you're talking about "any individual who is a convicted sex offender, or appears on any federal or state sex offender registry." That is far, far broader than rape and encompasses non-violent and even victimless crimes. The most obvious and absurd of those being the cases of minors who are dating each other, con sensually able to have sex, who send a nude photo to one another and are convicted for the production of child pornography and put on the sex offender registry.
https://www.huffingtonpost.com/entry/teens-nude-photos-penalties_us_55f07586e4b0...
https://www.outsidethebeltway.com/north-carolina-teen-charges-as-a-sex-offender-...
https://reason.com/blog/2016/02/03/male-teen-takes-nude-photo-of-himself-ch
"If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind."
~John Stuart Mill~