I don't know more about the FoF than what's in the article, but I've done some reading about a similar sexual assault ridden cult, NXIUM, and their the hierarchy was such that clearly some people were assaulting, and some were assaulted (and some were on both sides at different points), and I would want to be damn sure that I was firing people on the assaulting side but not the people on the assaulted side of the line, and for the people who were both... I dunno, really hard question.
How can you be that gullible and still be considered top tier talent?
Calling BSA and SBC cults is pure word play on your part. No reasonable person believes these are cults.
As for gullibility: would you support firing anyone who has been the VICTIM of domestic violence? A lot of the ways that cults convince people to stay are similar to the ways that domestic abusers convince their victims to stay, the methods are remarkably similar. So would being a victim of long-running abusive relationship be a sign that one isn't top tier talent in a job? Should all of them be fired? If you find yourself horrified by that idea, then I would suggest that you are being rather too aggressive towards cults, and forgetting that probably a majority of the cults members are more victim than perpetrator, though doubtless many are both to some degree.
Easily? I don't think there is any reason to think people good at programming are any less susciptible to being manipulated than anyone else.
Somewhere in my employment letter it says, I'm representing the company outside my workplace and work hours as well (that is in personal life too), I can be fired if I bring disrepute to company anytime - ex. drunken brawl in a nightclub.