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'm not sure about the connection you're making. Is it combining my points that tone is set from the top, and people are apt to overshoot their prejudices beyond their evidence?
My old theory about the nastiness of some anti-PC reactionaries was that they came to their view out of some animus.
Your suggestion that communities' tones may be determined by that of a small number of incumbents serves as an alternative, softening explanation.