Why does the myth of Presidents Day persist?

Why does the myth of Presidents Day persist?
The official name for the holiday celebrated Feb. 17, 2014, is Washington’s Birthday. Here are three theories as to why the name Presidents Day endures

When is Presidents Day 2014? The correct answer to that question is “never.” When it comes to federal holidays, there is no such thing as Presidents Day. We’ve been saying this for years, but shockingly, the charade continues.

The official name for the holiday celebrated Feb. 17, 2014, is Washington’s Birthday. If you don’t believe us, look at the Office of Personnel Management’s list of 2014 holidays for federal workers.

http://news.yahoo.com/why-does-myth-us-presidents-day-persist-144110372.html

Found this interesting, even if authors seems a little nit-picky on issue.