Your source is an editorial opinion by a person published in a public forum.... It hold no more weight than something originating here....
It is not a "News Article"... it clearly states at the top of the page that it is an " opinion" submitted to the newspaper by someone...Do you know what they say about opinions ?
To be total screw ups, and still keep their jobs.
In Canada teachers do well by the union.
Unions in US have noteeth these days it seems...
Not the teacher's union. They are very powerful.