You didn't get downvoted for raising a dissenting voice: well-thought-out posts dissenting from the perceived SingInst party line on subjects perceived as on-topic, such as singularitarianism or cryonics, can and do get heavily upvoted. You got downvoted for pushing a fringe opinion on a highly politicized topic, in a forum where it's perceived as inappropriate to do so, and now you're getting downvoted for doing it again.
Politics makes people stupid. Attempts to politicize LW are correctly interpreted as attacks on the site's collective sanity, about half a step up from actual trolling. I'm not sure it's possible to discuss "9/11 Truth" theories in a politically neutral manner, but for your posts to have even a chance of being well received you'll probably need to exercise much greater caution than you've presented them with so far.
I'd recommend not trying.
I intended Leveling Up in Rationality to communicate this:
But some people seem to have read it and heard this instead:
This failure (on my part) fits into a larger pattern of the Singularity Institute seeming too arrogant and (perhaps) being too arrogant. As one friend recently told me:
So, I have a few questions: