First issue - outside of "my IQ is..." bragging rights, intelligence is multi-dimensional. If not fractal. The IQ-ish dimensions are usually overrated - especially by folks for whom that's their strong suit, and by the young. Vs. the emotional maturity, big pictures, and wisdom-ish dimensions are really seldom understood, let alone mastered, until your later years. There are some old proverbs about the wisdom and (un…
This is the reason I shy away from using the term IQ. I do not believe it's a valid test on the individual level.
>If it's "homeopathy would be better than vaccines for our baby"-class stuff
A lot of it is this level. In fact, homeopathy is a major point of contention.