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.
I think it would've been better received if some attention was given to defense mechanisms - ie, rather than phrasing it as some true things being unconditionally bad to know, phrase it as some true things being bad to know unless you have the appropriate prerequisites in place. For example, knowing about differences between races is bad unless you are very good at avoiding confirmation bias, and knowing how to detect errors in reasoning is bad unless you are very good at avoiding motivated cognition.