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.
Here's something that might work as an alternative example that doesn't imply as much bigotry on anybody's part: a PNAS study from earlier this year found that during a school year, schoolgirls with more maths-anxious female maths teachers appear to develop more stereotyped views of gender and maths achievement, and do less well in their maths classes.
Let's suppose the results of that study were replicated and extended. Would a female maths teacher be justified in refusing to think about the debate over sex and IQ/maths achievement, on the grounds that doing so is likely to generate maths anxiety and so indirectly harm their female students' maths competence?
[Edited so the hyperlink isn't so long & ugly.]