What do you believe that most people on this site don't?
I'm especially looking for things that you wouldn't even mention if someone wasn't explicitly asking for them. Stuff you're not even comfortable writing under your own name. Making a one-shot account here is very easy, go ahead and do that if you don't want to tarnish your image.
I think a big problem with a "community" dedicated to being less wrong is that it will make people more concerned about APPEARING less wrong. The biggest part of my intellectual journey so far has been the acquisition of new and startling knowledge, and that knowledge doesn't seem likely to turn up here in the conditions that currently exist.
So please, tell me the crazy things you're otherwise afraid to say. I want to know them, because they might be true.
I think I agree with your premises here, but my conclusion is that our predictions will be weakly correlated with reality and our best plans will have a 55% or 51% success rate, not that they will have no effect or negative effect.
There no reason to assume that messing with a complex system that you don't understand means that you will have on average a 50% success rate.
There are many cases where trying to push a complex system into a local optima might have bad consequences. The system might get more robust but lose resiliency.