Because every teacher you've known for the past 15 years
joins the NEA and sends them money.
Beware.
They swear they have no choice, no dues, no job. they tell me they are are strong armed and these teachers are from several different states, don't know each other and aren't collaberating.
My wife and myself are both newly-employed teachers. We've sworn that not one cent from our household will go to the NEA.
And damned proud of it :-)