Have enemies; but make sure that they think about you much, much more than you think about them. - Nassim Nicholas Taleb

It is a very recent disease to mistake the unobserved for the nonexistent; but some are plagued with the worse disease of mistaking the unobserved for the unobservable.

Psychologists use "IQ" to politely put people & entire races in boxes with the label "idiots", and stick them there for a lifetime. They ruin people's careers and potentials. Politely. I call psychologists (& IQ mountebanks) idiots to their face. Not politely.

To make ethical choices you cannot have dilemmas between the particular (friends, family) and the general.