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 can think of a number of reasons why monarchs may suffer somewhat less from the 'power corrupts' norm. (1) often educated from childhood to use power wisely (2) often feel their power is legit and therefore less fearful of overthrow (3) tend to get better 'press' than other autocrats so that abuse of power less noticeable (4) often have continuity and structure in their advisors inherited from previous monarch.
Despite this, there have been some pretty nasty monarchs through history - even ones that are thought of as great like Good Queen Bess. However, if I had to live in an autocratic state I would prefer an established monarchy, all others things being equal.