Effective altruism is based on the core belief that all people count equally. We unequivocally condemn Nick Bostrom’s recklessly flawed and reprehensible words. We reject this unacceptable racist language, and the callous discussion of ideas that can and have harmed Black people. It is fundamentally inconsistent with our mission of building an inclusive and welcoming community.
— The Centre for Effective Altruism
There was a time when being a nonbeliever put you at serious risk of loosing everything (in the muslim countries they'll still kill you for apostasy). So elite groups which understood that the forcefully imposed religious consensus was obviously wrong would instead setup a fake version of Christianity for new recruits, and then once these rose in the ranks tell them "yeah it's obviously bullshit, congrats for suspecting it... but you are not allowed to say it!"
Of course every once in a while, someone high up goes rogue or forgets the vow of silence, and gets caned. Everyone else at the higher ranks submits the formulaic denunciation, and the lie continues until the next person screws up (or their heresy gets revealed when they are investigated for entirely unrelated things).
https://slatestarcodex.com/2017/10/23/kolmogorov-complicity-and-the-parable-of-lightning/
It's not a moral fault to not finds these things out on your own but to join the mob instantly against a titan falls without wondering whether he was in fact expressing the well understood fact, which is also a taboo enforced by complete personal destruction... God, save us from these dim-witted inquisitors, for they know not what they do.
Well, at least now Bostrom will have his name on the same list as James Watson, Francis Kirk and Galileo.
Consider that perhaps the reason most of us on the forum aren't agreeing with you- and the reason Bostrom himself repudiated his words- isn't the taboo around the belief, but rather that most of us think the evidence is unconvincing at best.
But most of us are not willing to have the object-level debate here for reasons such as politics being mindkiller, not wanting this to become a forum for debating taboo positions, and yes, internal and public perception of the community.
(I don't have survey data or anything, but I'd bet this is the case.)
If so, to the extent the majority of EA's tend to be right about things, you should update in that direction in lieu of having the thoughtful critiques of your position.