A few examples (in approximately increasing order of controversy):
If you proceed anyway...
- Identify knowledge that may be dangerous. Forewarned is forearmed.
- Try to cut dangerous knowledge out of your decision network. Don’t let it influence other beliefs or your actions without your conscious awareness. You can’t succeed completely at this, but it might help.
- Deliberately lower dangerous priors, by acknowledging the possibility that your brain is contaminating your reasoning and then overcompensating, because you know that you’re still too overconfident.
- Spend a disproportionate amount of time seeking contradictory evidence. If believing something could have a great cost to your values, make a commensurately great effort to be right.
- Just don’t do it. It’s not worth it. And if I found out, I’d have to figure out where you live, track you down, and kill you.
This "it" may, or even should, relate to the idea itself. The same idea, the same meme, put into a healthy rational brains anywhere, will decide the same! Since the brains are just a rational machine always doing the best possible thing.
It is the input, what decides the output. Machine has no other (irrational) choices, than to process the input best way it can, and then to spit out the output.
It is not my calculator only, which outputs "12" to the input "5+7". It is every unbroken calculator in the world, which outputs the same.
So again. The input "decides" what the output should be, not the computer (brains).
This would also be true of unbroken brains, if there were any.