IQ is very varied, but my point was the general level of IQ in the general population has not risen or fallen since the 60s.

Capitals are often used incorrectly.  All the more reason to take every opportunity to use them properly, so that examples are all around.  An institution whose sole aim is to educate failing to use capitals correctly on the board outside seems perverse.  If we are going to change how capitals are used, fair enough.  Language develops over time.  But current rules of grammar, punctuation, etc, need to be adhered to by those responsible for passing on those rules to the next generation, IMV.